Female Fuhrers: A look at the women who surrounded Hitler after he came to power and how they were held up as an Aryan ideal for German society to strive for. (S1, ep 1).

A team of experts investigate some of the most well-known UFO cases of the last 75 years, hoping to uncover the truth. (S1, ep 3).

The Sentinels: Seven stone giants stand guard over a Pacific island. But what are they protecting? And from whom? (S11, ep 9).

Russia Declassified: Have the US and Russia been working together from the beginning of the Space Race in preparation for the ultimate extraterrestrial encounter? (S11, ep 10).

They Came from the Sky: Ancient Astronaut theorists explore the idea that meteorites could be pieces of extraterrestrial technology. (S11, ep 11).

Montana Freeman Militia: Leroy Schweitzer breaks away from the US and takes advantage of everyone that decides to follow him, resulting in a prolonged armed standoff in 1996. (S1, ep 4).

Submerged: A Turkish drought reveals a long-lost Basilica and its secrets, while the hull of a ship in the North Sea answers decades-old questions. (S1, ep 4).

The Sentinels: Seven stone giants stand guard over a Pacific island. But what are they protecting? And from whom? (S11, ep 9).

Russia Declassified: Have the US and Russia been working together from the beginning of the Space Race in preparation for the ultimate extraterrestrial encounter? (S11, ep 10).

A team of experts investigate some of the most well-known UFO cases of the last 75 years, hoping to uncover the truth. (S1, ep 3).

Chachapoya, Celts, Carthage: Discover mummies from an ancient civilisation and visit the Tophet of Carthage. Was this simply a children's cemetery or a place of sacrifice? (S1, ep 4).

Treasure of the Vikings: The Viking Age saw major changes in the economy of Scandinavia. Tim Sutherland travels to Norway and Estonia to find out more about the bullion economy. (S1, ep 4).

The Invasion of Grenada: In 1979, Maurice Bishop takes control of Grenada. Four years later, he is assassinated. Is this another case of the US using its might to stop Communism? (S2, ep 6).

The Troubling Tale of Bute Inlet Gold Pt. 1: The search for Slumach's gold sends the team 300 kilometres away into the heart of the mystery. (S1, ep 6).

Chachapoya, Celts, Carthage: Discover mummies from an ancient civilisation and visit the Tophet of Carthage. Was this simply a children's cemetery or a place of sacrifice? (S1, ep 4).

Treasure of the Vikings: The Viking Age saw major changes in the economy of Scandinavia. Tim Sutherland travels to Norway and Estonia to find out more about the bullion economy. (S1, ep 4).

Bigfoot: Is this half-man, half-ape simply a figment of our collective imagination or does he really exist? Experts ask whether he is being hidden from us and why. (S1, ep 8).

America's Alien Wars: Startling evidence suggests the US military has been under attack from aliens for 50 years. Could they be keeping such a huge secret from the public? (S1, ep 15).

Da Vinci's Armageddon: Was Leonardo Da Vinci, one of history's great thinkers also one of its greatest prophets? And did he envision world destruction? (S1, ep 3).

The Iceman's Curse: A stone-age mummy emerges from the icy alps and unleashes a spell of death for those who dare get too close. (S1, ep 1).

In 1974, a Saskatchewan farmer reports seeing objects hovering in a field before they vanish into the ether. Connecticut citizens witness strange lights and a giant UFO in 1984. (S1, ep 13).

A couple spot a huge blimp-shaped craft hovering over Michigan's Lake Erie in 1988. In 1963, two sisters and their housekeeper report being knocked down by a UFO emitting flames. (S2, ep 1).

The Sentinels: Seven stone giants stand guard over a Pacific island. But what are they protecting? And from whom? (S11, ep 9).

Russia Declassified: Have the US and Russia been working together from the beginning of the Space Race in preparation for the ultimate extraterrestrial encounter? (S11, ep 10).

They Came from the Sky: Ancient Astronaut theorists explore the idea that meteorites could be pieces of extraterrestrial technology. (S11, ep 11).

High Tech Surveillance: In the spy game, listening, learning and gaining the ability to eavesdrop requires ingenuity.

The Invasion of Grenada: In 1979, Maurice Bishop takes control of Grenada. Four years later, he is assassinated. Is this another case of the US using its might to stop Communism? (S2, ep 6).

The Pyramid Tool Kit, the Killer Foot Machine and the Lost Head: Examine an ancient pyramid toolkit, a device that unleashes lethal X-rays and a divisive terracotta sculpture. (S2, ep 6).

The Hidden Empire: Ancient Astronaut theorists suggest that China, with its history of technological advancement and isolationism, could have been the home of alien beings. (S9, ep 10).

Space Station Moon: It was mankind's finest hour, the greatest technological achievement of the 20th century - the Apollo 11 mission to the Moon. (S9, ep 11).

Hawaii Volcanoes National Park: The Hawaii Volcanoes National Park is the site of strange events. Are they linked to the legendary Native Hawaiian Goddess of the Volcano, Pele? (S1, ep 3).

Joshua Tree National Park: Are UFO sightings at Joshua Tree linked to an anti-aging machine and a powerful creature called the Yucca Man? (S1, ep 4).

London: Andy visits Britain's oldest shop, drinks coffee with a corpse and discovers a 19th-century time machine hidden in an urban cemetery. (S1, ep 12).

Knaresborough Castle: The final hunt of the series takes the team back to Yorkshire to uncover relics from the brutal 14th Century clashes between the English and Scottish. (S2, ep 6).

The Hidden Empire: Ancient Astronaut theorists suggest that China, with its history of technological advancement and isolationism, could have been the home of alien beings. (S9, ep 10).

Space Station Moon: It was mankind's finest hour, the greatest technological achievement of the 20th century - the Apollo 11 mission to the Moon. (S9, ep 11).

Glacier National Park: In Montana's Glacier National Park, some claim that there is a hidden underground Nazi base that may even have been the final hideout for Hitler himself. (S1, ep 5).

Mount Shasta National Forest: From inexplicable disappearances to mysterious experiments, events in Mount Shasta National Park may be explained by an ancient Karuk Indian legend. (S1, ep 6).

Voodoo Hogs: Troy gets a call from a local rancher with a huge problem - feral hogs are tearing his property apart. Is the ranch plagued by a curse? (S2, ep 1).

Boeing B-29: Superfortress: The story of the prolonged development and the initially troubled operational history of the Boeing B29 Superfortress. (4 of 6).

The U-Boat Terror: Inspired by the story of his two cousins that died at sea in WWII, Ross Kemp heads up to Scapa Flow where he finds treasure that could link back to his family. (1 of 4).

Alien Contact: For years, people have claimed to have had direct, personal contact with aliens. The team tracks down some of those who claim to have had such contact. (S1, ep 4).

Zoo Poo: An almost 100-year-old Model A filled with crickets needs a major overhaul. In Georgia, Knoxy and Wu disinfect a horrendous Honda HR-V covered in animal faeces. (S1, ep 17).

Retch Ranger: In North Carolina, Jamie hopes to put a Honda CRX that's literally in pieces back together. In Georgia, Knoxy tries to flip a repulsive Ford Ranger. (S1, ep 18).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 12).

Labor of Love: Ton and Allen land a surprising set of storage vaults containing a 1980s Ms Pac-Man arcade machine and a collection of vintage Air Jordan trainers. (S2, ep 3).

Disco and Dice: Ton and Allen go head-to-head with a rival auction hunter. Plus, they find a retro pinball machine and a put a vintage breathalyser to the test. (S2, ep 4).

Ireland: Many restless souls lay trapped inside Ireland's castles, as the country boasts a dark history of magic, ritual and prime evil worship. (4 of 4).

Hidden in Africa: Was the Ark of the Covenant stolen by King Solomon's son and taken to Ethiopia? Archaeologists investigate new, mysterious leads to uncover the truth. (S1, ep 6).

Super Rats: Rats are the stuff of nightmares and recent archaeological evidence suggests that they once grew to massive sizes. Could these huge rodents make a comeback.

The Hidden Empire: Ancient Astronaut theorists suggest that China, with its history of technological advancement and isolationism, could have been the home of alien beings. (S9, ep 10).

Space Station Moon: It was mankind's finest hour, the greatest technological achievement of the 20th century - the Apollo 11 mission to the Moon. (S9, ep 11).

The Pyramid Tool Kit, the Killer Foot Machine and the Lost Head: Examine an ancient pyramid toolkit, a device that unleashes lethal X-rays and a divisive terracotta sculpture. (S2, ep 6).

Boeing B-29: Superfortress: The story of the prolonged development and the initially troubled operational history of the Boeing B29 Superfortress. (4 of 6).

The U-Boat Terror: Inspired by the story of his two cousins that died at sea in WWII, Ross Kemp heads up to Scapa Flow where he finds treasure that could link back to his family. (1 of 4).

Alien Contact: For years, people have claimed to have had direct, personal contact with aliens. The team tracks down some of those who claim to have had such contact. (S1, ep 4).

Russia's Secret Files: Russia spans over six million square miles of some of the most rugged terrain on Earth, much of which is uninhabited and largely unexplored. (S9, ep 12).

Beyond Roswell: The US military has denied that the 1947 Roswell crash was anything other than a weather balloon, but FBI files include a memo that indicate otherwise. (S9, ep 13).

Glacier National Park: In Montana's Glacier National Park, some claim that there is a hidden underground Nazi base that may even have been the final hideout for Hitler himself. (S1, ep 5).

Mount Shasta National Forest: From inexplicable disappearances to mysterious experiments, events in Mount Shasta National Park may be explained by an ancient Karuk Indian legend. (S1, ep 6).

Voodoo Hogs: Troy gets a call from a local rancher with a huge problem - feral hogs are tearing his property apart. Is the ranch plagued by a curse? (S2, ep 1).

Battle of Culloden: Rick and Beau return to tackle new rivers in a brand-new series. From Wales to Scotland, the pair investigate the cold and murky waters of historic sites. (1 of 3).

Russia's Secret Files: Russia spans over six million square miles of some of the most rugged terrain on Earth, much of which is uninhabited and largely unexplored. (S9, ep 12).

Beyond Roswell: The US military has denied that the 1947 Roswell crash was anything other than a weather balloon, but FBI files include a memo that indicate otherwise. (S9, ep 13).

El Yunque National Forest: Few know that one of the US's most mysterious National Parks is in Puerto Rico - a place some believe is home to a creature known as the Chupacabra. (S1, ep 7).

Big Bend National Park: A series of incidents in Big Bend National Park leave experts convinced of secret alien activities taking place there. (S2, ep 1).

Dead Zone: A suspicious disappearance in Troy's backyard sends the King of the Swamp deep into the bayou to confront beasts known and unknown. (S2, ep 2).

He-111: Germany's Frontline Bomber: A look at one of the most-recognised German aircrafts of WWII and how it became a guinea pig for future bombers. (5 of 6).

The Kaiser Sunken Fleet: Ross Kemp continues his adventure in Scapa Flow, plunging down on the wrecks of a German warship and an experimental submarine aircraft called the M2. (S1, ep 2).

Abductions: This episode chronicles several close encounters with alien abductees who have been held captive, probed, examined and had objects implanted in their bodies. (S1, ep 5).

Road Trip Ready: In Minnesota, a customer wants his crusty Cabriolet transformed into a road-worthy vehicle he can take cross country with his dad. (S1, ep 19).

Swamp Thing: In North Carolina, Jamie transforms a mouldy Hummer into a show stunner. In Georgia, a disgusting Dodge Dakota is cleansed of years of algae and rat poop. (S1, ep 20).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 13).

A team of experts investigate some of the most well-known UFO cases of the last 75 years, hoping to uncover the truth. (S1, ep 4).

Albert Speer: In his role as Adolf Hitler's favourite architect, Albert Speer was a central figure in the Fuhrer's inner circle and helped cement his position in power. (S1, ep 1).

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 7).

Maximum Security: Meet the three figures who broke the bank on top-of-the-range security features designed to prevent break-ins. (S1, ep 5).

Gold Fever: For these ancient figures, acquiring and spending enormous stockpiles of gold was an all-consuming passion. (S1, ep 6).

Russia's Secret Files: Russia spans over six million square miles of some of the most rugged terrain on Earth, much of which is uninhabited and largely unexplored. (S9, ep 12).

Beyond Roswell: The US military has denied that the 1947 Roswell crash was anything other than a weather balloon, but FBI files include a memo that indicate otherwise. (S9, ep 13).

Albert Speer: In his role as Adolf Hitler's favourite architect, Albert Speer was a central figure in the Fuhrer's inner circle and helped cement his position in power. (S1, ep 1).

He-111: Germany's Frontline Bomber: A look at one of the most-recognised German aircrafts of WWII and how it became a guinea pig for future bombers. (5 of 6).

The Kaiser Sunken Fleet: Ross Kemp continues his adventure in Scapa Flow, plunging down on the wrecks of a German warship and an experimental submarine aircraft called the M2. (S1, ep 2).

Abductions: This episode chronicles several close encounters with alien abductees who have been held captive, probed, examined and had objects implanted in their bodies. (S1, ep 5).

The Returned: Thousands of people from every part of the world have reported being abducted by aliens, including even a world leader - President Kiran Ilyumzhinov. (S9, ep 15).

Shiva The Destroyer: Of all the Hindu gods, none is more important than Shiva, the great destroyer. Could the deity have been the leader of an extraterrestrial race? (S9, ep 16).

El Yunque National Forest: Few know that one of the US's most mysterious National Parks is in Puerto Rico - a place some believe is home to a creature known as the Chupacabra. (S1, ep 7).

Big Bend National Park: A series of incidents in Big Bend National Park leave experts convinced of secret alien activities taking place there. (S2, ep 1).

Dead Zone: A suspicious disappearance in Troy's backyard sends the King of the Swamp deep into the bayou to confront beasts known and unknown. (S2, ep 2).

The Welsh Rebellion: Rick and Beau return to tackle new rivers in a brand-new series. From Wales to Scotland, the pair investigate the cold and murky waters of historic sites. (2 of 3).

The Returned: Thousands of people from every part of the world have reported being abducted by aliens, including even a world leader - President Kiran Ilyumzhinov. (S9, ep 15).

Shiva The Destroyer: Of all the Hindu gods, none is more important than Shiva, the great destroyer. Could the deity have been the leader of an extraterrestrial race? (S9, ep 16).

Cleveland National Forest: Explore Cleveland National Forest, where reports of gun-wielding ghosts, savage creatures and otherworldly portals are rife. (S2, ep 3).

Apache-Sitgreaves National Forest: A trip through the ginormous forest in Arizona. Strange encounters rumoured to have happened there include an alien abduction. (S2, ep 4).

The Devil's Swamp: The King of the Swamp investigates disturbing phenomena in a malevolent section of a swamp home to strange creatures. (S2, ep 3).

The Mosquito: The Wooden Wonder: The fascinating story behind the stunning wooden aircraft, which undertook some of the most daring and iconic raids of WWII. (6 of 6).

Slaver Ship Secrets: Ross Kemp is shocked by what he discovers as he dives on the wreck of a steam-age ship in north Devon, and a potential early slaver ship in Plymouth. (S1, ep 3).

Crash and Retrieval: The team head to Mexico to the site of an alleged international incident involving the remains of a UFO wreck. (S1, ep 6).

Nazi Railways: Series exploring the role of trains in the major conflicts of the past 150 years. Auschwitz survivors explore the railways' part in the Nazis' mass murder. (S1, ep 1).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 8).

Secrets of Ancient Structures: Age-old ruins can stand with their true history seemingly erased by time - can modern research discover why these ancient structures were built? (S4, ep 2).

Strange Technology: There are many puzzling artefacts from around the world, challenging everything known about the technological capabilities of distant ancestors. (S4, ep 6).

Finger of Death: A grim discovery in a Swedish lake reveals shocking ancient practices. Meanwhile, in the Canadian Arctic, the fossil of a previously unknown mammal is found. (S3, ep 1).

A look at the possibility that life began on Mars and travelled to Earth. Plus, if aliens exist, what plans do they have in store for us? Experts investigate. (S1, ep 5).

The Returned: Thousands of people from every part of the world have reported being abducted by aliens, including even a world leader - President Kiran Ilyumzhinov. (S9, ep 15).

Shiva The Destroyer: Of all the Hindu gods, none is more important than Shiva, the great destroyer. Could the deity have been the leader of an extraterrestrial race? (S9, ep 16).

George II - Warring King: George II is known for military exploits, but family conflicts and his father's scars threaten the Hanoverian succession. (S1, ep 2).

The Mosquito: The Wooden Wonder: The fascinating story behind the stunning wooden aircraft, which undertook some of the most daring and iconic raids of WWII. (6 of 6).

Slaver Ship Secrets: Ross Kemp is shocked by what he discovers as he dives on the wreck of a steam-age ship in north Devon, and a potential early slaver ship in Plymouth. (S1, ep 3).

Crash and Retrieval: The team head to Mexico to the site of an alleged international incident involving the remains of a UFO wreck. (S1, ep 6).

Forged by the Gods: Examining otherworldly artefacts as physical evidence of extraterrestrial visits, including a strange metal sphere that defies the laws of physics. (S10, ep 2).

The Mystery of Rudloe Manor: In the countryside of Wiltshire, England lies Rudloe Manor. A quaint manor house? Or epicentre of British UFO research since World War II? (S10, ep 1).

Cleveland National Forest: Explore Cleveland National Forest, where reports of gun-wielding ghosts, savage creatures and otherworldly portals are rife. (S2, ep 3).

Apache-Sitgreaves National Forest: A trip through the ginormous forest in Arizona. Strange encounters rumoured to have happened there include an alien abduction. (S2, ep 4).

The Devil's Swamp: The King of the Swamp investigates disturbing phenomena in a malevolent section of a swamp home to strange creatures. (S2, ep 3).

Roman Scotland: Rick and Beau return to tackle new rivers in a brand-new series. From Wales to Scotland, the pair investigate the cold and murky waters of historic sites. (3 of 3).

Forged by the Gods: Examining otherworldly artefacts as physical evidence of extraterrestrial visits, including a strange metal sphere that defies the laws of physics. (S10, ep 2).

The Mystery of Rudloe Manor: In the countryside of Wiltshire, England lies Rudloe Manor. A quaint manor house? Or epicentre of British UFO research since World War II? (S10, ep 1).

Great Smokey Mountains National Park: A stroll through a national park that is the alleged underground base for a powerful secret society. (S2, ep 5).

Mark Twain National Forest: Some claim that the dark, mysterious energies that surround this national park point to treasures from a lost civilisation that are hidden there. (S2, ep 6).

Quest for Bayou Gold: Troy Landry chases legendary treasure hidden deep in the bayou, helped by his right-hand man Pickle Wheat and veteran hunter Don Brewer. (S2, ep 4).

F15: The F15 Eagle immediately turned the tide of the first Gulf War to prove its greatness. (S2, ep 1).

Gun Runners: Hearing about his great-grandfather who served in the Merchant Navy inspires Ross to explore the wreck of a WWII cargo ship and try to recover its military supplies. (S1, ep 4).

Invasion Texas 2008: The UFO Hunters travel to Stephenville, Texas to investigate multiple reports of strange lights in the sky. (S1, ep 7).

Death Railway: Veterans and historians tell the story of the Thai-Burma railway and the countless prisoners of war and slave labourers who lost their lives building it. (S1, ep 2).

Investigate the haunting history of the town that time forgot, unexplained circles in the New Mexico desert and a possible clue to extra-terrestrial life in the Arctic. (S5, ep 1).

Qin Shi Tomb, Soma, Chinchorro: What could justify the tomb of Qin Shi Huang, the first Emperor of China, being so grand? And can signs of cannibalism shed light on Neanderthals? (S1, ep 5).

The First Viking Raid: Lindisfarne was a peaceful, holy island, until the Vikings arrived. Tim Sutherland joins archaeologists as they uncover the realities of the Viking raid. (S1, ep 1).

Sin City Meltdown: With no humans around, discover the fate of Las Vegas and Atlantic City, where the ocean would tear apart casinos and a new rat pack would take over.

Leased to the Devil, Maternity Ward Menace: A woman tries to banish a shadow from her office. A man claims he has experienced poltergeists and the spirit of a dead doctor. (S1, ep 7).

Forged by the Gods: Examining otherworldly artefacts as physical evidence of extraterrestrial visits, including a strange metal sphere that defies the laws of physics. (S10, ep 2).

The Mystery of Rudloe Manor: In the countryside of Wiltshire, England lies Rudloe Manor. A quaint manor house? Or epicentre of British UFO research since World War II? (S10, ep 1).

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 7).

F15: The F15 Eagle immediately turned the tide of the first Gulf War to prove its greatness. (S2, ep 1).

Gun Runners: Hearing about his great-grandfather who served in the Merchant Navy inspires Ross to explore the wreck of a WWII cargo ship and try to recover its military supplies. (S1, ep 4).

Invasion Texas 2008: The UFO Hunters travel to Stephenville, Texas to investigate multiple reports of strange lights in the sky. (S1, ep 7).

The Alien Architects: Why do many ancient architectural wonders bear similarities despite being built by different civilisations? Could aliens have designed them? (S10, ep 3).

The Pharaohs' Curse: Could a curse really exist on Tutankhamun's tomb, but in the form of alien technology designed to protect an incredible secret about our past? (S10, ep 4).

Great Smokey Mountains National Park: A stroll through a national park that is the alleged underground base for a powerful secret society. (S2, ep 5).

Canyonlands National Park: A demonic truck driver, disembodied voices, nightmarish skinwalkers and a time loop are all reported to exist in Canyonlands National Park. (S2, ep 12).

Quest for Bayou Gold: Troy Landry chases legendary treasure hidden deep in the bayou, helped by his right-hand man Pickle Wheat and veteran hunter Don Brewer. (S2, ep 4).

Snapshot: Ten glassblowers take up the challenge to make a piece of art that represents who they are, by using photographs from their past. (S1, ep 1).

Potluck Party: The remaining contestants create masterpieces such as a bento box and a glass taco stand in a food-themed challenge. (S1, ep 2).

The Alien Architects: Why do many ancient architectural wonders bear similarities despite being built by different civilisations? Could aliens have designed them? (S10, ep 3).

The Pharaohs' Curse: Could a curse really exist on Tutankhamun's tomb, but in the form of alien technology designed to protect an incredible secret about our past? (S10, ep 4).

Chaco Culture National Historical Park: Built by the ancient Anasazi, spooky sightings in this national park include shape-shifting creatures and time-traveling Wingmakers. (S2, ep 7).

Yosemite National Park: The infamous Yosemite National Park has a darker side that includes mysterious sightings, disappearances and even a prehistoric pterodactyl. (S2, ep 8).

Croc Invasion: Troy rushes to Florida to find a Nile crocodile, one of the world's deadliest animals - and recruits expert gator wranglers to capture the beast. (S2, ep 5).

B17: The mighty Flying Fortress takes to the air as we examine the background and development of one of WWII's most iconic bombers. (S2, ep 2).

Rise of the Bomber: The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (1 of 6).

UFO Dogfights: The team examines a declassified US Department of Defense report which analyses an alleged encounter between a fighter pilot and a UFO. (S1, ep 8).

Ambulance Trains: From the trench to the home front hospital, a medical historian retraces the train journey made by wounded soldiers during World War I. (S1, ep 3).

Investigate alien-like metal monsters coming from the sea, a war between 30 million crabs and an army of killer ants, and the white wall of death from which there is no escape. (S5, ep 2).

Halifax Explosion: When the SS Mont-Blanc and the SS Imo collided in 1917 in the harbour of Halifax, Canada, the subsequent explosion killed or injured almost 11,000 people. (S1, ep 3).

Nazi She-Devil: Explore how women were active, often violent participants in the war and its atrocities - especially during the holocaust. (S1, ep 2).

Striking Distance: It's 1944 and Sgt Jack Werner is among the men storming the beaches of Leyte in the Philippines to liberate the POWs who have been stranded there. (7 of 10).

Cambodian Civil War: From 1969 to 1973, US forces bomb Cambodia and the country falls into a brutal form of communism. Did the US' involvement pave the way for Pol Pot's regime? (S2, ep 7).

The Alien Architects: Why do many ancient architectural wonders bear similarities despite being built by different civilisations? Could aliens have designed them? (S10, ep 3).

The Pharaohs' Curse: Could a curse really exist on Tutankhamun's tomb, but in the form of alien technology designed to protect an incredible secret about our past? (S10, ep 4).

Rise of the Machines: While the single shot rifle remained a mainstay until WWI, machine guns had been in development since the final days of the American Civil War. (2 of 3).

B17: The mighty Flying Fortress takes to the air as we examine the background and development of one of WWII's most iconic bombers. (S2, ep 2).

Rise of the Bomber: The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (1 of 6).

UFO Dogfights: The team examines a declassified US Department of Defense report which analyses an alleged encounter between a fighter pilot and a UFO. (S1, ep 8).

Return to Antarctica: Rumours are rife that aliens inhabit the continent of Antarctica, but is it true? This episode explores the icy wilderness to find out. (S12, ep 1).

The Badlands Guardian: The series investigates satellite images of what seems to be a giant face carved into the earth in Alberta. Could this have extraterrestrial origins? (S12, ep 2).

Element 115: Physicist Bob Lazar says he was hired to reverse-engineer an alien spacecraft by the US government, with a fuel source that had the power to change the world. (S12, ep 3).

War of the Republic of Texas: The movement for Texas to gain independence takes a dangerous turn. When rivalling groups start taking hostages - the Texas Rangers must intervene. (S1, ep 5).

Ancient Civilisations: Nubian pyramids reveal the rise of female power in Ancient Kush, while satellite images uncover secrets of an ancient Puebloan site in New Mexico. (S1, ep 5).

Return to Antarctica: Rumours are rife that aliens inhabit the continent of Antarctica, but is it true? This episode explores the icy wilderness to find out. (S12, ep 1).

The Badlands Guardian: The series investigates satellite images of what seems to be a giant face carved into the earth in Alberta. Could this have extraterrestrial origins? (S12, ep 2).

A look at the possibility that life began on Mars and travelled to Earth. Plus, if aliens exist, what plans do they have in store for us? Experts investigate. (S1, ep 5).

Striking Distance: It's 1944 and Sgt Jack Werner is among the men storming the beaches of Leyte in the Philippines to liberate the POWs who have been stranded there. (7 of 10).

Investigate the haunting history of the town that time forgot, unexplained circles in the New Mexico desert and a possible clue to extra-terrestrial life in the Arctic. (S5, ep 1).

A team of experts investigate some of the most well-known UFO cases of the last 75 years, hoping to uncover the truth. (S1, ep 4).

A look at the possibility that life began on Mars and travelled to Earth. Plus, if aliens exist, what plans do they have in store for us? Experts investigate. (S1, ep 5).

Finger of Death: A grim discovery in a Swedish lake reveals shocking ancient practices. Meanwhile, in the Canadian Arctic, the fossil of a previously unknown mammal is found. (S3, ep 1).

UFO Dogfights: The team examines a declassified US Department of Defense report which analyses an alleged encounter between a fighter pilot and a UFO. (S1, ep 8).

The Jericho Head, the Cloudbuster and the Map: Examine a 9,000-year-old clay head, a 1950s machine built to control the weather and a map which could be the oldest ever found. (S2, ep 7).

Pirates and Tornados: Flying into a highly volatile region, crews battle pirates, tornadoes and riots to salvage a wrecked cargo ship. (S1, ep 6).

The End Game: The battle hits a turning point and Donitz unleashes an advanced torpedo to flip the momentum. Roberts and Laidlaw must devise a strategy to combat the new threat. (S1, ep 6).

Suicidal Maidens: This episode delves into Hitler's controlling sexual nature. The four women pursued by him, including his niece, only saw one way out of the relationship - death. (4 of 4).

Return to Antarctica: Rumours are rife that aliens inhabit the continent of Antarctica, but is it true? This episode explores the icy wilderness to find out. (S12, ep 1).

The Badlands Guardian: The series investigates satellite images of what seems to be a giant face carved into the earth in Alberta. Could this have extraterrestrial origins? (S12, ep 2).

Element 115: Physicist Bob Lazar says he was hired to reverse-engineer an alien spacecraft by the US government, with a fuel source that had the power to change the world. (S12, ep 3).

Nazi She-Devil: Explore how women were active, often violent participants in the war and its atrocities - especially during the holocaust. (S1, ep 2).

A team of experts investigate some of the most well-known UFO cases of the last 75 years, hoping to uncover the truth. (S1, ep 4).

Finger of Death: A grim discovery in a Swedish lake reveals shocking ancient practices. Meanwhile, in the Canadian Arctic, the fossil of a previously unknown mammal is found. (S3, ep 1).

The Star Gods of Sirius: Experts investigate whether aliens from a tiny star visited humans in the past, and left behind a clue that still remains in our language. (S12, ep 4).

They Came From The Sea: From octopuses that can edit their DNA to jellyfish that can live forever, were the unusual creatures of our oceans delivered to Earth by aliens? (S12, ep 5).

Secrets of the Maya: When Spanish Conquistadors obliterated the Mayan people's history, could they have erased proof of extraterrestrial visitors? Experts investigate. (S12, ep 6).

Burning Rainbow Farm: Tom Crosslin and his partner Rolland Rohm held pro-marijuana festivals at Rainbow Farm before a teenager's death and a standoff stun the local community. (S1, ep 6).

Unreachable Places: Discover strange markings in the remote region of Northern Finland and reveal secrets found deep in the Antarctic. (S1, ep 6).

The Star Gods of Sirius: Experts investigate whether aliens from a tiny star visited humans in the past, and left behind a clue that still remains in our language. (S12, ep 4).

They Came From The Sea: From octopuses that can edit their DNA to jellyfish that can live forever, were the unusual creatures of our oceans delivered to Earth by aliens? (S12, ep 5).

Qin Shi Tomb, Soma, Chinchorro: What could justify the tomb of Qin Shi Huang, the first Emperor of China, being so grand? And can signs of cannibalism shed light on Neanderthals? (S1, ep 5).

The First Viking Raid: Lindisfarne was a peaceful, holy island, until the Vikings arrived. Tim Sutherland joins archaeologists as they uncover the realities of the Viking raid. (S1, ep 1).

Cambodian Civil War: From 1969 to 1973, US forces bomb Cambodia and the country falls into a brutal form of communism. Did the US' involvement pave the way for Pol Pot's regime? (S2, ep 7).

The Jericho Head, the Cloudbuster and the Map: Examine a 9,000-year-old clay head, a 1950s machine built to control the weather and a map which could be the oldest ever found. (S2, ep 7).

Qin Shi Tomb, Soma, Chinchorro: What could justify the tomb of Qin Shi Huang, the first Emperor of China, being so grand? And can signs of cannibalism shed light on Neanderthals? (S1, ep 5).

The First Viking Raid: Lindisfarne was a peaceful, holy island, until the Vikings arrived. Tim Sutherland joins archaeologists as they uncover the realities of the Viking raid. (S1, ep 1).

Cambodian Civil War: From 1969 to 1973, US forces bomb Cambodia and the country falls into a brutal form of communism. Did the US' involvement pave the way for Pol Pot's regime? (S2, ep 7).

Time Travel: Could the ability to travel through time be real? Experts unseal new evidence suggesting this phenomenon of science fiction might not be as far-fetched as it seems. (S1, ep 16).

Nazis Today: Many believe Hitler and key members of his inner circle survived the fall of Berlin. If so, where did they go? And did they flee with plans for revenge? (S1, ep 17).

Doomsday Hieroglyphs: New research and modern computer graphics shed light on our doomed future as forecast in centuries gone by. Can we avoid our fate by heeding these warnings? (S1, ep 4).

Abandon All Hope Diamond: A diamond with a sinister past, the bones of a world-famous bard and a beach covered in cursed stones - who dares to disturb their peace? (S1, ep 2).

In 1993, a teenage girl walking her dog in Shropshire, England, witnesses a cylindrical object in the sky. School kids in Florida report multiple UFO sightings in 1967. (S2, ep 2).

In 1966, two Ohio police officers spot a strange light in the sky, triggering a chase across state lines. An ex-military man in Florida is knocked out by a beam of light in 1965. (S2, ep 3).

The Star Gods of Sirius: Experts investigate whether aliens from a tiny star visited humans in the past, and left behind a clue that still remains in our language. (S12, ep 4).

They Came From The Sea: From octopuses that can edit their DNA to jellyfish that can live forever, were the unusual creatures of our oceans delivered to Earth by aliens? (S12, ep 5).

Secrets of the Maya: When Spanish Conquistadors obliterated the Mayan people's history, could they have erased proof of extraterrestrial visitors? Experts investigate. (S12, ep 6).

Deadly Poisons: For some covert missions, assassination is the goal, and lethal toxins are deployed by spy agencies to kill perceived foes.

The Jericho Head, the Cloudbuster and the Map: Examine a 9,000-year-old clay head, a 1950s machine built to control the weather and a map which could be the oldest ever found. (S2, ep 7).

The Mosquito: The Wooden Wonder: The fascinating story behind the stunning wooden aircraft, which undertook some of the most daring and iconic raids of WWII. (6 of 6).

The Science Wars: Examining claims that extraordinary discoveries are being ignored by the scientific community for not conforming to their accepted paradigm. (S10, ep 5).

City of the Gods: The ancient metropolis of Teotihuacan, called The City of The Gods by the Aztecs, is a site of great mystery. Could alien beings have once lived there? (S10, ep 6).

Apache-Sitgreaves National Forest: A trip through the ginormous forest in Arizona. Strange encounters rumoured to have happened there include an alien abduction. (S2, ep 4).

Yosemite National Park: The infamous Yosemite National Park has a darker side that includes mysterious sightings, disappearances and even a prehistoric pterodactyl. (S2, ep 8).

Croc Invasion: Troy rushes to Florida to find a Nile crocodile, one of the world's deadliest animals - and recruits expert gator wranglers to capture the beast. (S2, ep 5).

Lighten Up: The eight artists are challenged to make a light fixture using techniques such as colour wrapping, hot sculpting and making bubbles with baking soda. (S1, ep 3).

Clash of the Robots: The seven contestants put their skills into making a glassy robot prototype that can preform chores and tasks. (S1, ep 4).

The Science Wars: Examining claims that extraordinary discoveries are being ignored by the scientific community for not conforming to their accepted paradigm. (S10, ep 5).

City of the Gods: The ancient metropolis of Teotihuacan, called The City of The Gods by the Aztecs, is a site of great mystery. Could alien beings have once lived there? (S10, ep 6).

Great Sand Dunes National Park: A stroll through Great Sand Dunes National Park, where strange lights, animal mutilations and other bizarre incidents have been spotted. (S2, ep 9).

Cleveland National Forest: Explore Cleveland National Forest, where reports of gun-wielding ghosts, savage creatures and otherworldly portals are rife. (S2, ep 3).

Skunk Ape: Deep in the Everglades, Troy recruits an army of swampers to investigate reports of a possible beast - the Skunk Ape - probing his friend's home. (S2, ep 6).

B25: The mighty North American twin delivered the first blow in the fight back against Japan, in one of the most daring and audacious raids of all time. (S2, ep 3).

War Without Boundaries: The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (2 of 6).

Vortexes: The team travels to Sedona, Arizona, long known for strange phenomena, to interview witnesses to unexplained sightings of lights and objects in the skies. (S1, ep 9).

The First Railroad War: The story of the Great Locomotive Chase - an attempt by Northern spies to steal steam locomotive The General during the American Civil War. (S1, ep 4).

Explore the mystery of the stone giant and the vanishing desert kingdom, and nukes and spooks in the Middle East. Plus, Harry Potter's Hedwig reveals her dark side. (S5, ep 3).

Miami Heat: Ton and Allen uncover three out-of-this-world finds, including an early NASA countdown clock and a 1960s Delta Relay rocket. (S2, ep 5).

Chicago Grand Slam: Freezing Chicago throws up a 1984 snowmobile, a signed 1920s baseball glove and an authentic Robby the Robot collector toy. (S2, ep 6).

Queen Tiye: Examine the story of Queen Tiye, who - over 3,000 years ago - surpassed her rivals and inspired a religious revolution that changed Egypt and the world. (S1, ep 1).

France: Frenchman Fred Sirieix joins Al Murray to break down what really happened during the Napoleonic wars. Did Britain really win the battle of Waterloo.

Black Beast of Exmoor: On the moors of England over 200 livestock were torn apart between 1979 and 1983. Some suggest that this was the work of a strange 'black beast.

The Science Wars: Examining claims that extraordinary discoveries are being ignored by the scientific community for not conforming to their accepted paradigm. (S10, ep 5).

City of the Gods: The ancient metropolis of Teotihuacan, called The City of The Gods by the Aztecs, is a site of great mystery. Could alien beings have once lived there? (S10, ep 6).

Suicidal Maidens: This episode delves into Hitler's controlling sexual nature. The four women pursued by him, including his niece, only saw one way out of the relationship - death. (4 of 4).

B25: The mighty North American twin delivered the first blow in the fight back against Japan, in one of the most daring and audacious raids of all time. (S2, ep 3).

War Without Boundaries: The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (2 of 6).

Vortexes: The team travels to Sedona, Arizona, long known for strange phenomena, to interview witnesses to unexplained sightings of lights and objects in the skies. (S1, ep 9).

The Alien Frequency: Different cultures have used mantras and chanting for thousands of years - could these in fact be a method of communing with extraterrestrial forces? (S10, ep 7).

The Majestic Twelve: Did a top secret group of officials, dubbed the Majestic Twelve, really create a space programme that has already established bases on the moon? (S10, ep 8).

Great Sand Dunes National Park: A stroll through Great Sand Dunes National Park, where strange lights, animal mutilations and other bizarre incidents have been spotted. (S2, ep 9).

Cleveland National Forest: Explore Cleveland National Forest, where reports of gun-wielding ghosts, savage creatures and otherworldly portals are rife. (S2, ep 3).

Skunk Ape: Deep in the Everglades, Troy recruits an army of swampers to investigate reports of a possible beast - the Skunk Ape - probing his friend's home. (S2, ep 6).

Thirsty Work: The contestant's next challenge is to make drinking glasses and decanters in a combination of fashion and function. (S1, ep 5).

Pop Art Blowup: The remaining contestants must get creative to make colourful works of art out of everyday household items. (S1, ep 6).

The Alien Frequency: Different cultures have used mantras and chanting for thousands of years - could these in fact be a method of communing with extraterrestrial forces? (S10, ep 7).

The Majestic Twelve: Did a top secret group of officials, dubbed the Majestic Twelve, really create a space programme that has already established bases on the moon? (S10, ep 8).

Crater Lake National Park: This tourist hotspot is also rumoured to be the epicentre of dark and sinister forces from Native American lore that lure visitors to their deaths. (S2, ep 11).

Canyonlands National Park: A demonic truck driver, disembodied voices, nightmarish skinwalkers and a time loop are all reported to exist in Canyonlands National Park. (S2, ep 12).

A Family Secret: Armed with a mysterious map and unprecedented access to sacred Native American land, the Weibert family sets out to solve the mystery of Custer's lost gold. (S1, ep 1).

B24: The Liberator proved its worth in WWII over Europe and the Pacific, modeled after the B-17, delivering blows to the Axis. (S2, ep 4).

The Means to Victory: The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (3 of 6).

The NASA Files: The team analyses incredible NASA footage of reported UFOs, and interviews former NASA employees who allegedly witnessed cover ups first hand. (S1, ep 10).

Precious Cargo: The astonishing accounts of four railway journeys that changed history, including the perilous expedition that made a young Winston Churchill world famous. (S1, ep 5).

Learn about the mystery of the vanishing lake, toxic hell storms, CIA-trained killer monks and polar bears that stalked stricken World War II heroes. (S5, ep 4).

A team of experts investigate some of the most well-known UFO cases of the last 75 years, hoping to uncover the truth. (S1, ep 5).

Wernher Von Braun: Wernher von Braun was vital to NASA's Apollo 11 mission to put a man on the Moon, but this 'American hero' had his Nazi past kept under wraps. (S1, ep 2).

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 8).

Unreal Estates: Immerse yourself in the jaw-dropping world of three crazy rich ancients who built some of the largest, most luxurious palaces ever known to man. (S1, ep 7).