UFO Zones: Journey to the world's hottest UFO zones, where physical and paranormal phenomenons and unidentified objects and aliens are reported with alarming frequency. (S3, ep 17).

Countdown To Disclosure: Evidence suggests the world's governments could be on the verge of announcing everything they know about UFOs. What will this mean for our society? (S3, ep 18).

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).

Aliens And Temples Of Gold: Experts examine beliefs that a French church provides a gateway to another universe. Plus, could the Sphinx be built on a library left by aliens? (S3, ep 4).

Aliens And Mysterious Rituals: Experts question whether the notion of rituals, such as funerals and festivals, was brought to earth by ancient extraterrestrial visitors. (S3, ep 5).

Mystery Skeleton of Belize: Archaeologists find an ancient structure built on granite columns, puzzling stone spheres are found in Costa Rica and Mexican skeletal remains emerge. (S1, ep 2).

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).

Explore the most dangerous hotel on the planet, check out the world's most fascinating beaches, visit a used car market in Benin and take a tour of a diamond mine in Russia. (S1, ep 12).

Aliens And Temples Of Gold: Experts examine beliefs that a French church provides a gateway to another universe. Plus, could the Sphinx be built on a library left by aliens? (S3, ep 4).

Aliens And Mysterious Rituals: Experts question whether the notion of rituals, such as funerals and festivals, was brought to earth by ancient extraterrestrial visitors. (S3, ep 5).

The Chalice: The most stunning relic in Hamilton and Carl's collection - the black obsidian chalice - is examined. The pair then head to Portugal to hunt for clues about it. (S1, ep 2).

Win Every War. Germany: Al joins forces with German comedian Henning Wehn to delve deeper into the truth behind some World War II myths.

Venetians, Crusaders, Byzantium: Chart the rise and fall of the Christian empires of Byzantium, the Crusaders and the Venetians through 10 sites, including St Mark's Basilica. (S1, ep 6).

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).

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).

Check out the Chinese railway that runs through residential buildings, take a tour of a mysterious forest in Poland and explore amazing underground locations around the world. (S1, ep 17).

Top Civilian Encounters: From mass sightings in the sky to reports of alien probes found in human bodies, explore the ten most disturbing extraterrestrial encounters ever. (S3, ep 19).

Alien Achilles Heel: Many believe aliens are already here on Earth. Could they be plotting an attack? And if so, can humans survive their weapons' terrifying capabilities? (S3, ep 20).

Jamaica: Al is joined by Chris Daley to uncover the real story of the pirates of the Caribbean and the barbaric realities of the slave trade. (S1, ep 2).

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).

Mystery Skeleton of Belize: Archaeologists find an ancient structure built on granite columns, puzzling stone spheres are found in Costa Rica and Mexican skeletal remains emerge. (S1, ep 2).

The Pirate Republic: Tensions rise between Benjamin Hornigold and Henry Jennings. Their rivalry heads in a new direction when Hornigold declares Nassau a pirate republic. (S1, ep 2).

Aliens And Temples Of Gold: Experts examine beliefs that a French church provides a gateway to another universe. Plus, could the Sphinx be built on a library left by aliens? (S3, ep 4).

Aliens And Mysterious Rituals: Experts question whether the notion of rituals, such as funerals and festivals, was brought to earth by ancient extraterrestrial visitors. (S3, ep 5).

Win Every War. Germany: Al joins forces with German comedian Henning Wehn to delve deeper into the truth behind some World War II myths.

Spanish Empires: Explore 10 sites that chart the rise of the crusading Catholic empire of Spain, beginning in the walled and highly religious medieval city of Avilla. (S1, ep 5).

Top Civilian Encounters: From mass sightings in the sky to reports of alien probes found in human bodies, explore the ten most disturbing extraterrestrial encounters ever. (S3, ep 19).

Alien Achilles Heel: Many believe aliens are already here on Earth. Could they be plotting an attack? And if so, can humans survive their weapons' terrifying capabilities? (S3, ep 20).

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).

Aliens And The Ancient Engineers: Experts investigate an ancient fortress in Peru said to have been built with laser tools. Could it prove that aliens once visited Earth? (S3, ep 6).

Aliens, Plagues And Epidemics: Experts investigate reports of strange bronze flying ships spotted during the Black Death. Could aliens have brought deadly disease to Earth? (S3, ep 7).

Mystery Fossil of Madagascar: In Madagascar, paleontologists discover an near-perfect fossil unlike any known animal, and bizarre stone spheres are found in Costa Rica. (S1, ep 3).

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).

Travel to the richest country on the planet, take a tour of a mind-blowing hotel in Italy, visit a chicken-shaped church in Indonesia and discover the hidden world under Moscow. (S1, ep 13).

Aliens And The Ancient Engineers: Experts investigate an ancient fortress in Peru said to have been built with laser tools. Could it prove that aliens once visited Earth? (S3, ep 6).

Aliens, Plagues And Epidemics: Experts investigate reports of strange bronze flying ships spotted during the Black Death. Could aliens have brought deadly disease to Earth? (S3, ep 7).

The Sword: A look at the most dramatic object in Hamilton and Carl's collection: the Knights Templar sword, which they believe might have been used at the Battle of Acre. (S1, ep 3).

Win Every War. The Romans: Bruno Tonioli joins Al to look at key battle tactics during the Roman Invasion back in AD 43.

Kings Of Europe: The story of Europe's greatest empires through 10 incredible sights including St Basil's Cathedral, the Palace of Versailles and Schonbrunn Palace. (S1, ep 7).

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).

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).

Visit a remarkable prison in South Korea, check out Bangkok's Ghost Tower and get to know the bicep-bulging men at Iceland's Jakabol Gym. (S1, ep 18).

UFOs over LA: February 1942, and the sky over Los Angeles erupts as anti-aircraft guns begin firing on strange targets. Could this have been an extraterrestrial raid? (1 of 6).

Tunneling to Freedom: A daring prison break, engineered by former teacher Colonel Thomas Rose, frees hundreds of captured Union soldiers during the Civil War. (S2, ep 7).

Now Available in Stores: Amidst financial troubles, Disney figure out how to bring their beloved characters off the screen and into the hands of millions through marketing. (S1, ep 4).

Mystery Fossil of Madagascar: In Madagascar, paleontologists discover an near-perfect fossil unlike any known animal, and bizarre stone spheres are found in Costa Rica. (S1, ep 3).

Medusa: Medusa is the most infamous female fiend in Greek mythology - whose look turned every living thing to stone. But what is the true story behind the myth? (S1, ep 4).

Aliens And The Ancient Engineers: Experts investigate an ancient fortress in Peru said to have been built with laser tools. Could it prove that aliens once visited Earth? (S3, ep 6).

Aliens, Plagues And Epidemics: Experts investigate reports of strange bronze flying ships spotted during the Black Death. Could aliens have brought deadly disease to Earth? (S3, ep 7).

Win Every War. The Romans: Bruno Tonioli joins Al to look at key battle tactics during the Roman Invasion back in AD 43.

Venetians, Crusaders, Byzantium: Chart the rise and fall of the Christian empires of Byzantium, the Crusaders and the Venetians through 10 sites, including St Mark's Basilica. (S1, ep 6).

UFOs over LA: February 1942, and the sky over Los Angeles erupts as anti-aircraft guns begin firing on strange targets. Could this have been an extraterrestrial raid? (1 of 6).

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).

Aliens And Lost Worlds: Experts search for proof of alien visitors in the ruins of lost civilisations. Could Mayan carvings reveal a city once ruled by otherworldly beings? (S3, ep 8).

Aliens And Deadly Weapons: From gunpowder to missiles, were these lethal weapons the product of human innovation or created with help from another, otherworldly source? (S3, ep 9).

Enigma Animal of Colombia: In the depths of the tropical lowlands of Northern Colombia, scientists discover a gargantuan, unidentified animal vertebra. (S1, ep 4).

The World at War: The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (4 of 6).

Visit the Devil's Pool in Zambia, explore the electrifying Tesla Tower in Moscow's abandoned woods and take a tour of the safest airport in the world. (S1, ep 14).

Aliens And Lost Worlds: Experts search for proof of alien visitors in the ruins of lost civilisations. Could Mayan carvings reveal a city once ruled by otherworldly beings? (S3, ep 8).

Aliens And Deadly Weapons: From gunpowder to missiles, were these lethal weapons the product of human innovation or created with help from another, otherworldly source? (S3, ep 9).

Libation Vessel: Exquisitely shaped from marble, the libation vessel is Carl's favourite piece in the hoard. Could its four carved heads be depictions of John The Baptist? (S1, ep 4).

Win Every War. America: Al faces up to the richest nation on Earth to discover how the former British colony of America somehow slipped through its fingers.

British Raj: An exploration of 10 sites that defined the power, wealth and brutality of the British Empire's rise and fall. (S1, ep 8).

The World at War: The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (4 of 6).

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).

Investigate the secrets behind the Hadzabe Myth in Tanzania, visit Colorado's incredible Cheyenne Mountain Complex and check out a fascinating abandoned boat in Croatia. (S1, ep 19).

Red Alert: During the Cold War, strange lights and unidentified objects put governments around the world on red alert. Could extra-terrestrials have been responsible? (2 of 6).

The Quest for the Holy Grail: As the Third Reich rises to power, Himmler fixates on the Holy Grail as his and the Nazis' desperation to capture this ancient relic intensifies. (S1, ep 3).

The Lonely Hearts Killers: Despicable duo Raymond Fernandez and Martha Beck team up to con lonely women across the nation, posing as siblings to rob them of their riches. (S1, ep 3).

Enigma Animal of Colombia: In the depths of the tropical lowlands of Northern Colombia, scientists discover a gargantuan, unidentified animal vertebra. (S1, ep 4).

The Scientist: Galen of Pergamon makes a name for himself as a physician for gladiators. Meanwhile, a devastating plague sweeps through the city. (S1, ep 6).

Aliens And Lost Worlds: Experts search for proof of alien visitors in the ruins of lost civilisations. Could Mayan carvings reveal a city once ruled by otherworldly beings? (S3, ep 8).

Aliens And Deadly Weapons: From gunpowder to missiles, were these lethal weapons the product of human innovation or created with help from another, otherworldly source? (S3, ep 9).

Win Every War. America: Al faces up to the richest nation on Earth to discover how the former British colony of America somehow slipped through its fingers.

Kings Of Europe: The story of Europe's greatest empires through 10 incredible sights including St Basil's Cathedral, the Palace of Versailles and Schonbrunn Palace. (S1, ep 7).

Red Alert: During the Cold War, strange lights and unidentified objects put governments around the world on red alert. Could extra-terrestrials have been responsible? (2 of 6).

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).

Aliens And Evil Places: Experts investigate creepy places associated with death. Could otherworldly connections be responsible for strange disappearances and suicides? (S3, ep 10).

Aliens And America's Founding Fathers: Could the Founding Fathers have hidden secrets about ancient aliens in their documents, buildings and symbols? Experts investigate. (S3, ep 11).

Ride of the Ancient Rhino: In the Philippines, archaeologists discover the remains of an ancient rhinoceros. Elsewhere, a Brazilian island is infested with thousands of vipers. (S1, ep 5).

By Night & By Day: The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (5 of 6).

Visit the fascinating Indian retreat where The Beatles meditated, explore a copycat Chinese city and check out a glass factory in Israel. (S1, ep 15).

Aliens And Evil Places: Experts investigate creepy places associated with death. Could otherworldly connections be responsible for strange disappearances and suicides? (S3, ep 10).

Aliens And America's Founding Fathers: Could the Founding Fathers have hidden secrets about ancient aliens in their documents, buildings and symbols? Experts investigate. (S3, ep 11).

Reliquary Box: A look at what is arguably the most intriguing item in Carl and Hamilton's collection: the 15th-century reliquary casket. Season finale. (S1, ep 5).

The Vikings: Comedian John Thomson and historian Janina Ramirez join Al to explore the truth about Vikings and how they were so successful in Britain.

America: From bustling ports and strategic forts, to cultural quirks and cathedrals of commerce, this episode tells the story of the US through 12 key sites. (S1, ep 9).

By Night & By Day: The story of a deadly war that intertwines Germany, Poland, Japan, Italy and Spain, and the remorseless development of weapons and bombers. (5 of 6).

Documentary lifting the lid on the story of Alfred Hagen and his expedition to discover and rescue The Swamp Ghost, a WWII B-17 Bomber that crashed in Papua New Guinea.

Travel to Abu Dhabi's incredible Masdar City, check out the Wieliczka Salt Mine in Poland and visit an Indian village where the houses don't have doors. (S1, ep 20).

Black Triangle: A look at some of the most widely witnessed UFO events ever, including large black triangular objects in the night sky regularly spotted in the 80s and 90s. (3 of 6).

The Museum of Natural History Heist: A trio risk it all to steal priceless jewels at the American Museum of Natural History, creeping 125 feet above the streets of Manhattan. (S1, ep 6).

The Head of the Snake: Posing as a drug dealer, undercover informant Tony Tait infiltrates the secret biker club to take down leader Sonny Barger and meth cook Kenny Owens. (S1, ep 7).

Ride of the Ancient Rhino: In the Philippines, archaeologists discover the remains of an ancient rhinoceros. Elsewhere, a Brazilian island is infested with thousands of vipers. (S1, ep 5).

The Georgians: Amanda learns the customs of a true society girl, while Dan makes his own animal intestine condom and discovers how many brothels existed in London at the time. (S1, ep 3).

Aliens And Evil Places: Experts investigate creepy places associated with death. Could otherworldly connections be responsible for strange disappearances and suicides? (S3, ep 10).

Aliens And America's Founding Fathers: Could the Founding Fathers have hidden secrets about ancient aliens in their documents, buildings and symbols? Experts investigate. (S3, ep 11).

The Vikings: Comedian John Thomson and historian Janina Ramirez join Al to explore the truth about Vikings and how they were so successful in Britain.

British Raj: An exploration of 10 sites that defined the power, wealth and brutality of the British Empire's rise and fall. (S1, ep 8).

Black Triangle: A look at some of the most widely witnessed UFO events ever, including large black triangular objects in the night sky regularly spotted in the 80s and 90s. (3 of 6).

Documentary lifting the lid on the story of Alfred Hagen and his expedition to discover and rescue The Swamp Ghost, a WWII B-17 Bomber that crashed in Papua New Guinea.

The Great Flood: Experts find evidence suggesting that ancient aliens saved humanity from great floods sent by the gods. Can we rely on extra-terrestrials to save us again? (S7, ep 8).

The Vanishings: Experts explore the disappearance of civilisations throughout time and across the globe. Could clues left in their wake point to an otherwordly explanation? (S7, ep 9).

Hidden Pyramids: Experts investigate ancient man's apparent obsession with building pyramids, and whether extra-terrestrials may have helped with their construction. (S7, ep 11).

Part Two: Follow the course of the invasion as Strongbow wins victory after victory, while Henry II arrives to take control of Ireland and grants land to settlers from Britain. (2 of 2).

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

The Wild Unknown: The wild is a rich setting for myths and legends, with countless tales about the wilderness and the fearsome monsters within it. (S1, ep 2).

The Great Flood: Experts find evidence suggesting that ancient aliens saved humanity from great floods sent by the gods. Can we rely on extra-terrestrials to save us again? (S7, ep 8).

The Vanishings: Experts explore the disappearance of civilisations throughout time and across the globe. Could clues left in their wake point to an otherwordly explanation? (S7, ep 9).

Visit the plastic bottle village in Panama, discover floating boats in Greece, take a journey to Chernobyl and investigate the impact of the Centralia mine fire in Pennsylvania. (S1, ep 16).

Secret Weapon Sabotage: An elite force of Norwegian resistance fighters return to their invaded homeland to carry out a daring mission. (S1, ep 1).

Wat Tyler's Rebellion: After the Black Death, the lower class demand better wages - but England's involvements in the Hundred Year War has left the treasury empty. (S1, ep 1).

If You Wish For Peace, Prepare For War: Small arms production hit a boom in the early 1800s with the emergence of the modern cartridge; an invention that led to the lethal package. (1 of 3).

Now Available in Stores: Amidst financial troubles, Disney figure out how to bring their beloved characters off the screen and into the hands of millions through marketing. (S1, ep 4).

Battle of Hastings: Exploring the impact of the Battle of Hastings in 1066, Karl and Kevin continue their look at how weapons and body armour developed. (S1, ep 3).

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).

The Scientist: Galen of Pergamon makes a name for himself as a physician for gladiators. Meanwhile, a devastating plague sweeps through the city. (S1, ep 6).

The Lonely Hearts Killers: Despicable duo Raymond Fernandez and Martha Beck team up to con lonely women across the nation, posing as siblings to rob them of their riches. (S1, ep 3).

The Great Flood: Experts find evidence suggesting that ancient aliens saved humanity from great floods sent by the gods. Can we rely on extra-terrestrials to save us again? (S7, ep 8).

The Vanishings: Experts explore the disappearance of civilisations throughout time and across the globe. Could clues left in their wake point to an otherwordly explanation? (S7, ep 9).

Hidden Pyramids: Experts investigate ancient man's apparent obsession with building pyramids, and whether extra-terrestrials may have helped with their construction. (S7, ep 11).

Medusa: Medusa is the most infamous female fiend in Greek mythology - whose look turned every living thing to stone. But what is the true story behind the myth? (S1, ep 4).

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

Arthur of Brittany: The Boy Who Should Have Been King: Explore the tale of the teenage Duke of Brittany and would-be King of England's suspicious demise. (S1, ep 3).

Prince George: Tragedy or Treason: Explore the mystery surrounding Prince George's death in 1942 - does the royal family's ambivalence prove that his death was no accident? (S1, ep 3).

The Alien Agenda: Ancient alien theorists investigate evidence suggesting that extraterrestrials have played a pivotal role in the progress of mankind. (S7, ep 12).

Aliens And Robots: Experts investigate ancient tales and accounts of robots. If these sophisticated machines did exist in bygone days, what might have happened to them? (S8, ep 1).

Aliens B.C: Experts investigate whether the stories of a time when gods and otherworldly beings inhabited the planet are more than mere mythology. (S8, ep 2).

Finding the Center: From flat earth legends to Galileo's telescope, explore the major changes in humans' scientific understanding of planet Earth throughout history. (S1, ep 2).

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

The Museum of Natural History Heist: A trio risk it all to steal priceless jewels at the American Museum of Natural History, creeping 125 feet above the streets of Manhattan. (S1, ep 6).

Visit a remarkable prison in South Korea, check out Bangkok's Ghost Tower and get to know the bicep-bulging men at Iceland's Jakabol Gym. (S1, ep 18).

Investigate the secrets behind the Hadzabe Myth in Tanzania, visit Colorado's incredible Cheyenne Mountain Complex and check out a fascinating abandoned boat in Croatia. (S1, ep 19).

Travel to Abu Dhabi's incredible Masdar City, check out the Wieliczka Salt Mine in Poland and visit an Indian village where the houses don't have doors. (S1, ep 20).

The Alien Agenda: Ancient alien theorists investigate evidence suggesting that extraterrestrials have played a pivotal role in the progress of mankind. (S7, ep 12).

Aliens And Robots: Experts investigate ancient tales and accounts of robots. If these sophisticated machines did exist in bygone days, what might have happened to them? (S8, ep 1).

Halfway through its fourth full year, the fortunes of war were running increasingly in favour of the Allies. The bombing of Hamburg and the Allied Tehran Conference take place. (S1, ep 6).

Tikal: Discover Tikal, one of the largest and most powerful archaeological sites and urban centers of pre-Columbian Mayan civilisation. (S3, ep 3).

Le Louvre: A look at the world's largest art museum, located in Paris, France and the home of the Mona Lisa.

Aliens B.C: Experts investigate whether the stories of a time when gods and otherworldly beings inhabited the planet are more than mere mythology. (S8, ep 2).

War: The violent story of Romulus and Remus, the brutal Vikings and the Valkyries, the Trojan War and exploring the influence of Homer's Iliad on Alexander the Great. (S1, ep 3).

Fame: Explore a collection of figures and groups who have redefined the notion of fame through history, from royal families across the globe to Marilyn Monroe and The Beatles. (S1, ep 6).

The Alien Agenda: Ancient alien theorists investigate evidence suggesting that extraterrestrials have played a pivotal role in the progress of mankind. (S7, ep 12).

Aliens And Robots: Experts investigate ancient tales and accounts of robots. If these sophisticated machines did exist in bygone days, what might have happened to them? (S8, ep 1).

Aliens B.C: Experts investigate whether the stories of a time when gods and otherworldly beings inhabited the planet are more than mere mythology. (S8, ep 2).

The Scientist: Galen of Pergamon makes a name for himself as a physician for gladiators. Meanwhile, a devastating plague sweeps through the city. (S1, ep 6).

The Tudor Tower: A new recruit joins the team and begins his career as a Beefeater with some testing exams. The Chief Curator reveals the history of Anne Boleyn within the walls. (2 of 4).

Amy Dudley: The Queen, Her Lover and His Wife: The death of Robert Dudley's wife in 1560 caused a scandal - as the nobleman was Elizabeth I's alleged lover. (S1, ep 4).

Ludwig II: The Mad King of Bavaria: Explore the controversy surrounding the death of the eccentric King Ludwig, whose unstable behaviour saw him deposed. (S1, ep 4).

Aliens And The Creation Of Man: Experts investigate the mysterious Creation of Man, asking whether unexplained advances in human evolution could have been down to aliens. (S3, ep 12).

Alien Messages: Could some of our ancient texts and structures be home to secret messages left by alien ancestors? If so, what can we learn from them? (S1, ep 6).

Pohnpei's Ancient City: In the northwestern Pacific, a tourist stumbles across a mysterious structure. Elsewhere, an unsettling sight is revealed on the island of New Guinea. (S1, ep 6).

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

Visit the plastic bottle village in Panama, discover floating boats in Greece, take a journey to Chernobyl and investigate the impact of the Centralia mine fire in Pennsylvania. (S1, ep 16).

Aliens And The Creation Of Man: Experts investigate the mysterious Creation of Man, asking whether unexplained advances in human evolution could have been down to aliens. (S3, ep 12).

Alien Messages: Could some of our ancient texts and structures be home to secret messages left by alien ancestors? If so, what can we learn from them? (S1, ep 6).

Belief and Superstition: Science reveals new insights into belief and superstition in the land of the Pharaohs, from finding the long-lost 'Land of Punt' to Tutankhamun. (S1, ep 1).

Win Every War. Scotland vs England: Al is joined by Sanjeev Kohli as they visit Craufurdland Castle to explore the truth behind famous battles from the Wars of Scottish Independence.

Japan: Travel through time to explore the past 1500 years of one of the world's most unique and diverse ancient cultures - Japan. (S1, ep 10).

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

The Disappeared: New theories shed light on the world's biggest mysteries, including the unsolved disappearances of aviator Amelia Earhart and hijacker DB Cooper. (S1, ep 1).

Grand Canyon National Park: A strange series of events in Grand Canyon National Park leads researchers to speculate whether its power comes from forces that cannot be explained. (S1, ep 1).

Everglades National Park: A plane crash in the Everglades National Park leads to strange hauntings - and some believe the park may exert a dark, transformative power. (S1, ep 2).

UFOs Crash Sites: Alien autopsies and recovered pieces of an extra-terrestrial spacecraft: this is the story of the Roswell incident and the truth behind the UFO. (4 of 6).

God's Holy Warriors: Did our ancestors believe they were cursed? Professor Alice Roberts explores historic cataclysmic events such as wars and floods to dispel the myths. (4 of 5).

The Mary Rose: Ross returns to training with dive master Neil Brock and explores the site of Britain's most famous wreck: the Mary Rose. (S1, ep 1).

Pohnpei's Ancient City: In the northwestern Pacific, a tourist stumbles across a mysterious structure. Elsewhere, an unsettling sight is revealed on the island of New Guinea. (S1, ep 6).

Henning Franzmeier and his team of archaeologists undertake excavations in Pi-Ramses, hoping to discover the truth about the ancient Egyptian pharaoh Ramses II's lost city. (1 of 2).

Aliens And The Creation Of Man: Experts investigate the mysterious Creation of Man, asking whether unexplained advances in human evolution could have been down to aliens. (S3, ep 12).

Aliens And Deadly Cults: A look at cases where people have claimed strange voices urged them to commit horrific deeds. Could they have been obeying the orders of aliens? (S3, ep 13).

Win Every War. Scotland vs England: Al is joined by Sanjeev Kohli as they visit Craufurdland Castle to explore the truth behind famous battles from the Wars of Scottish Independence.

America: From bustling ports and strategic forts, to cultural quirks and cathedrals of commerce, this episode tells the story of the US through 12 key sites. (S1, ep 9).

UFOs Crash Sites: Alien autopsies and recovered pieces of an extra-terrestrial spacecraft: this is the story of the Roswell incident and the truth behind the UFO. (4 of 6).

The Disappeared: New theories shed light on the world's biggest mysteries, including the unsolved disappearances of aviator Amelia Earhart and hijacker DB Cooper. (S1, ep 1).

Aliens And The Secret Code: Experts scrutinise prehistoric ruins, asking whether humans could have built these advanced structures alone. Might they have had alien help? (S3, ep 14).

The Tesla Experiment. Giorgio A Tsoukalos draws on evidence from past series as he asks whether Nikola Tesla was communicating with extraterrestrials. (S1, ep 3).

Creature of Lake Eacham: A mysterious creature that glows in the dark is discovered in the Australian rainforest. Hundreds of human bones are found in a Belizean cave. (S1, ep 7).

If You Wish For Peace, Prepare For War: Small arms production hit a boom in the early 1800s with the emergence of the modern cartridge; an invention that led to the lethal package. (1 of 3).

Check out the Chinese railway that runs through residential buildings, take a tour of a mysterious forest in Poland and explore amazing underground locations around the world. (S1, ep 17).

Aliens And The Secret Code: Experts scrutinise prehistoric ruins, asking whether humans could have built these advanced structures alone. Might they have had alien help? (S3, ep 14).

The Tesla Experiment. Giorgio A Tsoukalos draws on evidence from past series as he asks whether Nikola Tesla was communicating with extraterrestrials. (S1, ep 3).

Egyptian Genius: Journey back in time to understand the brainpower behind Ancient Egypt's revolutionary breakthroughs in every field, from medicine to engineering. (S1, ep 2).

India: Al Murray is joined by legendary master of stand-up, Anuvab Pal, to explore the truth about Britain's rocky relationship with India. (S1, ep 1).

Ancient Greece (Part 1): Explore the great historic sites of the Minoan civilisation on Crete, Mycenae in the Peloponnese and the emerging Greek city states such as Corinth. (S2, ep 1).

If You Wish For Peace, Prepare For War: Small arms production hit a boom in the early 1800s with the emergence of the modern cartridge; an invention that led to the lethal package. (1 of 3).

Cover-Ups: What's going on in Area 51? What crashed at Roswell? And what's happening at the top-secret Dugway Proving Ground? Experts go in search of answers. (S1, ep 2).

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).

UFO's vs Airlines: Are UFOs a threat to civil aviation? The culture of silence within the aviation industry could speak volumes. (5 of 6).

South Africa: Al and local comedian Loyiso Gola embark on a road trip through the true British imperial history in South Africa. (S1, ep 3).

The Other Cleopatra: Cleopatra II's reign was a truly dramatic and grisly tale. She saw her dynasty torn apart by hatred - but also saved it from destruction. (S1, ep 2).

Creature of Lake Eacham: A mysterious creature that glows in the dark is discovered in the Australian rainforest. Hundreds of human bones are found in a Belizean cave. (S1, ep 7).

The Price of Loyalty: Hornigold's crew deposes him for his refusal to attack English ships, but one man remains loyal. Pirate raids on British slaves provokes outrage. (S1, ep 3).

Aliens And The Secret Code: Experts scrutinise prehistoric ruins, asking whether humans could have built these advanced structures alone. Might they have had alien help? (S3, ep 14).

Aliens And The Undead: Experts study previous reports of zombies, vampires and spirits. Could these sightings of the undead actually have been alien encounters? (S3, ep 15).

India: Al Murray is joined by legendary master of stand-up, Anuvab Pal, to explore the truth about Britain's rocky relationship with India. (S1, ep 1).

Japan: Travel through time to explore the past 1500 years of one of the world's most unique and diverse ancient cultures - Japan. (S1, ep 10).

UFO's vs Airlines: Are UFOs a threat to civil aviation? The culture of silence within the aviation industry could speak volumes. (5 of 6).

Cover-Ups: What's going on in Area 51? What crashed at Roswell? And what's happening at the top-secret Dugway Proving Ground? Experts go in search of answers. (S1, ep 2).

Aliens Gods And Heroes: Ancient alien theorists explore the origins of mythical gods. Could these tales of superhuman beings be based on sightings of extraterrestrials? (S3, ep 16).

The Mayan Conspiracy: Experts investigate startling evidence suggesting that the Ancient Maya conspired with aliens. Was this how they acquired their knowledge of astrology? (S4, ep 1).

Stone Secrets of Kilwa Island: A mysterious site with huge stone blocks is discovered off the coast of Tanzania. In the Guatemalan rainforest, hundreds of human bones are found. (S1, ep 8).

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).

Visit a remarkable prison in South Korea, check out Bangkok's Ghost Tower and get to know the bicep-bulging men at Iceland's Jakabol Gym. (S1, ep 18).

Aliens Gods And Heroes: Ancient alien theorists explore the origins of mythical gods. Could these tales of superhuman beings be based on sightings of extraterrestrials? (S3, ep 16).

The Mayan Conspiracy: Experts investigate startling evidence suggesting that the Ancient Maya conspired with aliens. Was this how they acquired their knowledge of astrology? (S4, ep 1).

Villainy and Vice: Science shines a light on the dark side of Ancient Egypt, from a 5,000-year-old homicide to drug-fuelled debauchery - and one very shocking revelation. (S1, ep 3).

Jamaica: Al is joined by Chris Daley to uncover the real story of the pirates of the Caribbean and the barbaric realities of the slave trade. (S1, ep 2).

Ancient Greece (Part 2): Venture back to ancient Greece and explore the great sites of Athens, Delphi, Olympia and Epidaurus which form some of the greatest sites in antiquity. (S2, ep 2).

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).

Paranormal Destinations: Experts investigate the US government's experiments into teleportation. They also dig into strange happenings at Mount Shasta and Skinwalker ranch. (S1, ep 3).

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).

Shoot 'Em Down: Fighter pilots from the UK to Peru have encountered UFOs. What happens when a UFO gets too close for comfort? (6 of 6).

Breakout in Plain Sight: An Iranian-American psychopath goes to jail in Southern California, but escapes before he can be transferred to a higher security prison. (S2, ep 8).

Creating a New World: Against all odds, Disney turns 27,000 acres of muddy Florida swampland into the world's largest - and most visited - theme park. (S1, ep 5).

Stone Secrets of Kilwa Island: A mysterious site with huge stone blocks is discovered off the coast of Tanzania. In the Guatemalan rainforest, hundreds of human bones are found. (S1, ep 8).

Hades: Discover the myth of ancient Greece's most feared god. Hades takes us behind the veil of the ancient Greek belief in life after death with chilling tales. (S1, ep 2).

Aliens Gods And Heroes: Ancient alien theorists explore the origins of mythical gods. Could these tales of superhuman beings be based on sightings of extraterrestrials? (S3, ep 16).

The Mayan Conspiracy: Experts investigate startling evidence suggesting that the Ancient Maya conspired with aliens. Was this how they acquired their knowledge of astrology? (S4, ep 1).

Jamaica: Al is joined by Chris Daley to uncover the real story of the pirates of the Caribbean and the barbaric realities of the slave trade. (S1, ep 2).

Ancient Greece (Part 1): Explore the great historic sites of the Minoan civilisation on Crete, Mycenae in the Peloponnese and the emerging Greek city states such as Corinth. (S2, ep 1).

Shoot 'Em Down: Fighter pilots from the UK to Peru have encountered UFOs. What happens when a UFO gets too close for comfort? (6 of 6).

Paranormal Destinations: Experts investigate the US government's experiments into teleportation. They also dig into strange happenings at Mount Shasta and Skinwalker ranch. (S1, ep 3).

The Doomsday Prophecies: Experts scrutinise the Maya Calendar, which predicted the world would end in 2012. Could it have anticipated the arrival of an extraterrestrial god? (S4, ep 2).

The Greys: Experts investigate the 'greys' - mysterious beings with big heads and eyes found carved into rocks. Who are these strange figures and what inspired them? (S4, ep 3).

Secret Cave Of Kolombangara: A volcanic island called Kolombagara, with a secret cave, rises out of the Pacific Ocean. In Vietnam, bones from an unknown animal are found. (S1, ep 9).

The Gods of War: The industrial revolution changed it all when it came to cannons as they evolved from wholly inaccurate and immobile to deadly killing machines. (3 of 3).

Investigate the secrets behind the Hadzabe Myth in Tanzania, visit Colorado's incredible Cheyenne Mountain Complex and check out a fascinating abandoned boat in Croatia. (S1, ep 19).

The Doomsday Prophecies: Experts scrutinise the Maya Calendar, which predicted the world would end in 2012. Could it have anticipated the arrival of an extraterrestrial god? (S4, ep 2).

The Greys: Experts investigate the 'greys' - mysterious beings with big heads and eyes found carved into rocks. Who are these strange figures and what inspired them? (S4, ep 3).

Ancient Icons In The Modern Age: Explore the truth and lies behind ancient Egypt's best known and loved icons, including the Great Sphinx, Tutankhamun and more. (S1, ep 4).

South Africa: Al and local comedian Loyiso Gola embark on a road trip through the true British imperial history in South Africa. (S1, ep 3).

Dutch Golden Age (Part 1): Explore how the 80 Years' War left the Spanish Empire financially ruined, while the Dutch Republic - by contrast - became a global commercial power. (S2, ep 3).

The Gods of War: The industrial revolution changed it all when it came to cannons as they evolved from wholly inaccurate and immobile to deadly killing machines. (3 of 3).

Strange Triangles: Three places, three spooky stories. Experts examine weird sightings and unsolved disappearances at Bennington, Bermuda and Bridgewater triangles. (S1, ep 4).

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).

Gettysburg National Military Park: Many believe Gettysburg National Military Park is haunted by its violent past - here, explore some incredible claims about the park's history. (S1, ep 8).

The Doomsday Prophecies: Experts scrutinise the Maya Calendar, which predicted the world would end in 2012. Could it have anticipated the arrival of an extraterrestrial god? (S4, ep 2).

Into the Mountains (Tibet): Himmler's belief in the theory that the Himalayas were home to the Nazis' Aryan ancestors leads to an SS mission to the mountains. (S1, ep 4).

Haircut for a Mob Boss: Umberto 'Albert' Anastasia, once the chief of the notorious 'Murder Incorporated' crime firm, winds up the target of a mob hit in a barber shop chair. (S1, ep 4).

Secret Cave Of Kolombangara: A volcanic island called Kolombagara, with a secret cave, rises out of the Pacific Ocean. In Vietnam, bones from an unknown animal are found. (S1, ep 9).