From luxurious revolving rooms to colossal walls and the technology behind amphitheatres, discover the true power and scale of the Romans' ingenuity.

In the countryside of Wiltshire, England lies Rudloe Manor. A quaint manor house? Or epicentre of British UFO research since World War II.

Could claims of "The Nine" - a federation of extraterrestrial beings who monitor and influence mankind - have any credence? Experts believe so.

Earth Portals: Experts unravel the secrets of the universe's earth portals: shortcuts through space that allow travellers to span vast distances in the blink of an eye.

Solar System UFOs: Discover the shocking truth about alien civilisations in our solar system. Check out derelict spacecrafts and explore the mysterious origins of UFOs.

For five years, the Channel Islands were occupied by Nazi Germany. Here, Tony traces the still-visible story of the occupation.

Alice Roberts heads to the Midlands to take a look at the best archaeological finds from the heart of England.

Ton and Allen get a surprise when they win a classic GMC truck. They also find a first-of-its kind Coca-Cola vending machine. But is it the real McCoy.

Ton and Allen find centuries-old Masonic swords and a Nixon-era lie detector. Plus, they test out Civil War muskets on the firing range.

Stories of hospital ships and those who served on them, including the tragic story of the sinking of the Titanic's sister vessel, The Britannic.

Discover treasures and ancient manuscripts hidden in mysterious chambers, tunnels, caves and burial sites.

Explore and tackle the great unsolved mysteries of our world. Generations from now, their obscured truths will provide fertile ground for myth-making.

Dive into a video from the US Navy that proves once and for all that UFOs exist and examine an alleged Loch Ness monster sighting.

Edge Of The Abyss: True stories from WWII. After surviving the Battle of the Bulge, infantryman Rockie Blunt pushes towards the Rhine and the end of the war.

End Game: It is the final push in Europe, but before the Nazis surrender infantryman Rockie Blunt witnesses one of the greatest tragedies of the war: the concentration camps.

Why do many ancient architectural wonders bear similarities despite being built by different civilisations? Could aliens have designed them.

Ancient Astronaut theorists suggest that China, with its history of technological advancement and isolationism, could have been the home of alien beings.

Nazi UFOs: Could alien technology have helped the Nazis' rise to power? Experts question whether Hitler had extraterrestrial help in his quest for world domination.

Alien Bodies: Uncover the shocking truth about alien remains as experts investigate unsettling reports of extraterrestrial bodies recovered from crashed UFOs.

On the 800th anniversary of the signing of the Magna Carta, Tony unravels the history from the myths surrounding King John and Robin Hood.

Professor Alice Roberts heads to the West of England to showcase some of archelogy's greatest recent finds, including a new Roman town.

Discover treasures and ancient manuscripts hidden in mysterious chambers, tunnels, caves and burial sites.

Explore and tackle the great unsolved mysteries of our world. Generations from now, their obscured truths will provide fertile ground for myth-making.

Dive into a video from the US Navy that proves once and for all that UFOs exist and examine an alleged Loch Ness monster sighting.

Edge Of The Abyss: True stories from WWII. After surviving the Battle of the Bulge, infantryman Rockie Blunt pushes towards the Rhine and the end of the war.

End Game: It is the final push in Europe, but before the Nazis surrender infantryman Rockie Blunt witnesses one of the greatest tragedies of the war: the concentration camps.

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases.

Explore the fate of crypts, safes, time capsules, personal records and other human relics. Meanwhile, Marine Corps learn to succeed in the wild.

Why do many ancient architectural wonders bear similarities despite being built by different civilisations? Could aliens have designed them.

Ancient Astronaut theorists suggest that China, with its history of technological advancement and isolationism, could have been the home of alien beings.

Nazi UFOs: Could alien technology have helped the Nazis' rise to power? Experts question whether Hitler had extraterrestrial help in his quest for world domination.

Alien Bodies: Uncover the shocking truth about alien remains as experts investigate unsettling reports of extraterrestrial bodies recovered from crashed UFOs.

On the 800th anniversary of the signing of the Magna Carta, Tony unravels the history from the myths surrounding King John and Robin Hood.

Professor Alice Roberts heads to the West of England to showcase some of archelogy's greatest recent finds, including a new Roman town.

Ton discovers some 1920s prohibition whiskey that could have been smuggled by Al Capone. But will he sell it or swig it.

The guys head to a storage unit auction in California, where they win a 1940s arcade game, a 1901 Winchester shotgun and an antique crossbow.

Ships don't have to be large to make history, like the 1776 gunboat built to stop a British invasion, or the remarkable story of the HA-19 sub.

Why do many ancient architectural wonders bear similarities despite being built by different civilisations? Could aliens have designed them.

Ancient Astronaut theorists suggest that China, with its history of technological advancement and isolationism, could have been the home of alien beings.

Darkness Falls: Documentary series highlighting what life was really like during the Second World War, featuring the personal stories of soldiers from both sides of the conflict.

Hard Way Back: Series highlighting what life was like during WWII. Rookie platoon leader Charles Scheffel suffers his first losses as he battles Rommel's Afrika Korps in Tunisia.

Day Of Days: America is on the offensive, but fighting on the Normandy beaches is ferocious and victory will not come quickly, especially for Lt Charles Scheffel.

Tony heads out on a walk that reveals the story of the remarkable Bronte family, exploring how the moors inspired their most famous novels.

Alice Roberts tours the East of England, seeking out the biggest archaeological digs of the year and witnessing the uncovering of a hugely significant Roman mosaic.

Discover the most incredible archaeology from the north of Britain, including Scotland's oldest railway and one of the best-preserved Norman castles.

UFO Metal: Nations all over the world are rumoured to have found metal debris from UFO crashes. Join the investigation into the alleged wreckages of otherworldly crafts.

Triangle Terror: For years, the flying saucer has been synonymous with UFO terror. But is it still the spacecraft that frightens us the most? Or has fear taken a new shape.

Alien Skies: From mid-air abductions to near-disasters caused by unseen enemies, experts examine if we are alone in the skies over Earth.

The Next Wave: A fascinating look at the mounting evidence that suggests UFO waves are able to penetrate the world's most closely guarded airspace at will.

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.

Glory And Guts: True stories from WWII. Reporter Robert Sherrod accompanies Marines on their assault of Iwo Jima and witnesses the horror of the fight and the iconic flag raising.

Tony traces the Norman conquest of this part of Wales, which still feels more English than the rest of the country, nearly 1000 years later.

For five years, the Channel Islands were occupied by Nazi Germany. Here, Tony traces the still-visible story of the occupation.

In 1917, three young shepherd children from Fatima, Portugal, claimed to be instruments of divine prophecy. Was there truth to their allegations.

The most notorious madman in history, Adolf Hitler, was a murderer and a seducer of millions. But what role did prophecy and the occult play in his rise.

After Tsar Nicholas II and his family were killed by Bolsheviks in 1918, the fate of his daughter Anastasia became unknown - did she actually survive.

Why do many ancient architectural wonders bear similarities despite being built by different civilisations? Could aliens have designed them.

Ancient Astronaut theorists suggest that China, with its history of technological advancement and isolationism, could have been the home of alien beings.

Explore some of the most valuable treasures found in the most unlikely of ways.

On June 10, 1942, Major Georges Bergé's team landed in Crete to destroy Luftwaffe planes at Heraklion airfield. They faced a tough mission.

Garth Barnard investigates World War II air accidents, starting with a B-25 training crash in Virginia that killed five crew.

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.

In 1917, three young shepherd children from Fatima, Portugal, claimed to be instruments of divine prophecy. Was there truth to their allegations.

Ancient Astronaut theorists suggest that aliens may have colonised an ice-free Antarctica, before a global event plunged it into the Ice Age.

Ancient Astronaut theorists examine the creation myth of "The Cosmic Egg", and look at why the concept is so pervasive throughout the world.

Bloody Resolve: Series highlighting what life was really like on the frontlines during WWII. In Tarawa, mechanical failure leads to one of the bloodiest battles in the Pacific.

Battle Stations: It's 1944 and the Allies are planning the invasion of France. For pilot Bert Stiles that means joining the decimated 8th Air Force to clear the Normandy skies.

Point Of No Return: True stories from WWII. As Lt Charles Scheffel leads his unit across France, Marine Nolen Marbrey is wounded in the bloody battle of Peleliu in the Pacific.

Tony sets out on a walk across the Cairngorms to Balmoral, in the footsteps of Victoria and Albert, who promoted the Scottish Highlands.

The south of England offers rich pickings, including the earliest money made in Britain and a massive haul of Roman treasure.

Alice Roberts heads to the Midlands to take a look at the best archaeological finds from the heart of England.

Earth Portals: Experts unravel the secrets of the universe's earth portals: shortcuts through space that allow travellers to span vast distances in the blink of an eye.

Solar System UFOs: Discover the shocking truth about alien civilisations in our solar system. Check out derelict spacecrafts and explore the mysterious origins of UFOs.

Signs of Abduction: From loss of time and bizarre hazy memories, to terrifying accounts of alien surgery, these are the hidden signs of alien abduction.

Antigravity: Experts discuss the possibility of advanced alien technology that could allow UFOs to fly at blinding speed or hover effortlessly a few feet above the ground.

Edge Of The Abyss: True stories from WWII. After surviving the Battle of the Bulge, infantryman Rockie Blunt pushes towards the Rhine and the end of the war.

End Game: It is the final push in Europe, but before the Nazis surrender infantryman Rockie Blunt witnesses one of the greatest tragedies of the war: the concentration camps.

On the 800th anniversary of the signing of the Magna Carta, Tony unravels the history from the myths surrounding King John and Robin Hood.

Professor Alice Roberts heads to the West of England to showcase some of archelogy's greatest recent finds, including a new Roman town.

Explore the fate of crypts, safes, time capsules, personal records and other human relics. Meanwhile, Marine Corps learn to succeed in the wild.

US: Ross Kemp heads to New York, discovering the connection between USA and Britain in the rise of the mafia - as well as learning about the infamous Kray twins.

In the 5th century BC, Pericles paved the way for western civilisation when he raided defence funds to build Athens. Experts re-create this first major city.

Ancient Astronaut theorists suggest that aliens may have colonised an ice-free Antarctica, before a global event plunged it into the Ice Age.

Ancient Astronaut theorists examine the creation myth of "The Cosmic Egg", and look at why the concept is so pervasive throughout the world.

Explore mysterious secrets hidden in tunnels, caves and burial sites, from lost treasures to ancient manuscripts behind walls.

From secret nuclear programs to hidden Cold War bunkers, we uncover the surprising people and places behind top-secret discoveries.

Ten British commandos, led by Major Hasler, leave the submarine Junon to paddle to Bordeaux and sabotage German warships.

Explore the complex case of the death of Wladyslaw Sikorski, the Polish PM whose plane crashed soon after taking off in 1943.

Glory And Guts: True stories from WWII. Reporter Robert Sherrod accompanies Marines on their assault of Iwo Jima and witnesses the horror of the fight and the iconic flag raising.

Discover a real Chinese curse, a Founding Father's basement of bone and a deadly island hiding world-ending pathogens. Truth is stranger than fiction.

The Lagina Brothers and Matty Blake join the late Mel Fisher's famous family to search for emeralds from the Atocha shipwreck.

Witness supposed video evidence of a UFO over Houston, a creature in an attic and a sighting of Bigfoot in Utah.

On June 10, 1942, Major Georges Bergé's team landed in Crete to destroy Luftwaffe planes at Heraklion airfield. They faced a tough mission.

Ten British commandos, led by Major Hasler, leave the submarine Junon to paddle to Bordeaux and sabotage German warships.

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.

It was mankind's finest hour, the greatest technological achievement of the 20th century - the Apollo 11 mission to the Moon.

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.

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.

Tony arrives at the most rebellious corner of England as he looks back at the Duke of Monmouth's attempt to overthrow the British monarchy.

Another visit to the north for Alice, checking out evidence of early writing by the Picts in Scotland and a 3,000-year-old Bronze Age coffin.

Discover a real Chinese curse, a Founding Father's basement of bone and a deadly island hiding world-ending pathogens. Truth is stranger than fiction.

The Lagina Brothers and Matty Blake join the late Mel Fisher's famous family to search for emeralds from the Atocha shipwreck.

Witness supposed video evidence of a UFO over Houston, a creature in an attic and a sighting of Bigfoot in Utah.

On June 10, 1942, Major Georges Bergé's team landed in Crete to destroy Luftwaffe planes at Heraklion airfield. They faced a tough mission.

Ten British commandos, led by Major Hasler, leave the submarine Junon to paddle to Bordeaux and sabotage German warships.

Colombia: Ross sees just how prevalent cocaine is in Colombia as he joins an army raid, before meeting the son of Gilberto Rodriguez - a founder of the Cali Cartel.

The plot to blow up the Houses of Parliament has failed - and while mercenary Guido Fawkes is taken to the Tower of London, his accomplices are on the run.

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.

It was mankind's finest hour, the greatest technological achievement of the 20th century - the Apollo 11 mission to the Moon.

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.

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.

Tony arrives at the most rebellious corner of England as he looks back at the Duke of Monmouth's attempt to overthrow the British monarchy.

Another visit to the north for Alice, checking out evidence of early writing by the Picts in Scotland and a 3,000-year-old Bronze Age coffin.

Head behind the scenes with Ton and Allen as they offer a crash course on how to win big at auctions.

We learn about life on a Tudor ship from objects found on the Mary Rose, while on HMS Victory we learn the battle-winning tactics of Admiral Nelson.

A deadly discovery hiding under one of America's most national parks, a Nazi era weapon sunk off the coast of New Jersey.

Marty and Matty dig for treasure on the beaches of Tampa, Florida, believed to have been hidden in the early 1800s by a notable French pirate.

What's the truth behind the Chupacabra sighting? Is this the greatest UFO photo taken? What are those sounds on Mars.

On September 15, 1942, 12 commandos from the Special Operations Executive arrived in Northern Norway by submarine on a nearly suicidal mission.

During Italy's reconquest, the Allies faced the Winter Line and called in the First Special Service Force, elite troops trained for brutal terrain warfare.

Examining claims that extraordinary discoveries are being ignored by the scientific community for not conforming to their accepted paradigm.

Russia spans over six million square miles of some of the most rugged terrain on Earth, much of which is uninhabited and largely unexplored.

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.

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.

A look at one of Scotland's most popular paid tourist attraction. With a slew of sieges to its name, it is no surprise that the site boasts some formidable defences.

Hugh and the team attempt to uncover a Roman fort, connected to Hadrian's Wall, that's buried beneath the back gardens of Benwell in Newcastle.

A deadly discovery hiding under one of America's most national parks, a Nazi era weapon sunk off the coast of New Jersey.

Marty and Matty dig for treasure on the beaches of Tampa, Florida, believed to have been hidden in the early 1800s by a notable French pirate.

What's the truth behind the Chupacabra sighting? Is this the greatest UFO photo taken? What are those sounds on Mars.

On September 15, 1942, 12 commandos from the Special Operations Executive arrived in Northern Norway by submarine on a nearly suicidal mission.

During Italy's reconquest, the Allies faced the Winter Line and called in the First Special Service Force, elite troops trained for brutal terrain warfare.

When millions over the world vanish, a biblical prophecy known as the Rapture will be fulfilled. Are there signs of the prediction actually happening.

Sir Isaac Newton is considered one of history's great geniuses, but did you know he also predicted the date of the apocalypse.

Examining claims that extraordinary discoveries are being ignored by the scientific community for not conforming to their accepted paradigm.

Russia spans over six million square miles of some of the most rugged terrain on Earth, much of which is uninhabited and largely unexplored.

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.

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.

A look at one of Scotland's most popular paid tourist attraction. With a slew of sieges to its name, it is no surprise that the site boasts some formidable defences.

Hugh and the team attempt to uncover a Roman fort, connected to Hadrian's Wall, that's buried beneath the back gardens of Benwell in Newcastle.

Ton and Allen head to the Golden State, where a high-speed Quadzilla ATV awaits, along with a pair of assassin's guns and an 1880s palm squeezer.

Ton and Allen's luck is in as they score a turn-of-the-century Thomas Edison gramophone and a tiny one-man boat designed for high-speed fun.

A look at the tactics employed to pass strategically important ships under the nose of the enemy, and the use of intelligence to carry out naval attacks.

The exploits of pirates during the Golden Age of Piracy as they become infamous legends through heists and buried treasures still unfound.

Secrets of the Sterncastle: Matty and Tony join another epic hunt with the Fisher family to search for a motherload of treasure linked to the Atocha.

Did a man in Turkey capture an Alien piloting a UFO? What are the strange lights above Brown Mountain in North Carolina.

An elite force of Norwegian resistance fighters return to their invaded homeland to carry out a daring mission.

On the outskirts of Bouerat Harbor in Libya, a small group of British special forces prepare to destroy a crucial German fuel depot.

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.

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.

To enter space, humans require a space suit. Are the aliens that are said to have visited earth any different? Or are they more akin to artificial drones.

In Spring 1952, reports of UFO sightings shot through the roof. Can former US Air Officials shed any light on this.

Dan Jones explores the history of Cardiff castle over more than 2,000 years and reveals how it transformed into a lavish Victorian home.

Hugh and the team attempt to uncover a Viking burial ground hidden beneath Masham in North Yorkshire.

The exploits of pirates during the Golden Age of Piracy as they become infamous legends through heists and buried treasures still unfound.

Secrets of the Sterncastle: Matty and Tony join another epic hunt with the Fisher family to search for a motherload of treasure linked to the Atocha.

Did a man in Turkey capture an Alien piloting a UFO? What are the strange lights above Brown Mountain in North Carolina.

An elite force of Norwegian resistance fighters return to their invaded homeland to carry out a daring mission.

On the outskirts of Bouerat Harbor in Libya, a small group of British special forces prepare to destroy a crucial German fuel depot.

In the 5th century BC, Pericles paved the way for western civilisation when he raided defence funds to build Athens. Experts re-create this first major city.

Three of the most extravagant and expensive weddings in history are profiled. Lavish and luxurious was the only way to celebrate for these big spenders.

Meet the ancients who bankrolled the construction of massive churches and temples in a desperate attempt to buy their way into heaven.

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.

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.

To enter space, humans require a space suit. Are the aliens that are said to have visited earth any different? Or are they more akin to artificial drones.

In Spring 1952, reports of UFO sightings shot through the roof. Can former US Air Officials shed any light on this.

Dan Jones explores the history of Cardiff castle over more than 2,000 years and reveals how it transformed into a lavish Victorian home.

Hugh and the team attempt to uncover a Viking burial ground hidden beneath Masham in North Yorkshire.

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.

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.

The story of one of the world's most effective war machines: The Viking longship. They were elegant, versatile and feared.

Ancient technologies, seemingly advanced for their time, raise questions about modern innovations and the fate of those lost inventions.

Taking a new approach, Rick and Matty return to Poverty Island in Lake Michigan to search for missing Civil War gold.

What is the mysterious sea beast seen from UK shores? Are summoners able to commune with UFOs? Is the Earth alive.

It's July 10, 1943 and the Allied Forces have evicted the Axis Powers from North Africa and can finally begin the Italian Campaign.

December 1941: Under cover of a fierce naval bombardment, a taskforce of elite British commandos sail towards the Norwegian town of South Vaagso.

Different cultures have used mantras and chanting for thousands of years - could these in fact be a method of communing with extraterrestrial forces.

Thousands of people from every part of the world have reported being abducted by aliens, including even a world leader - President Kiran Ilyumzhinov.

In 1969, the US government officially announced it would stop investigating UFOs, but declassified documents seem to tell another story.

Did the space race stop at just the Moon? Is there any truth to rumours of a secret Space Force developed by America for missions beyond Earth's orbit.

Dan explores the history of York's castle, from the Viking Jorvik and the Normans, to the dark days of the anti-Jewish pogrom and the imprisonment of the Knights Templar.

Hugh and the team unearth William the Conqueror's lost priory hidden beneath Lenton in Nottingham.

Ancient technologies, seemingly advanced for their time, raise questions about modern innovations and the fate of those lost inventions.

Taking a new approach, Rick and Matty return to Poverty Island in Lake Michigan to search for missing Civil War gold.

What is the mysterious sea beast seen from UK shores? Are summoners able to commune with UFOs? Is the Earth alive.

It's July 10, 1943 and the Allied Forces have evicted the Axis Powers from North Africa and can finally begin the Italian Campaign.

December 1941: Under cover of a fierce naval bombardment, a taskforce of elite British commandos sail towards the Norwegian town of South Vaagso.

Discover how the incredible technology behind the ancient Greeks' Trireme war vessels and Roman emperor Caligula's opulent sex ships has defied reinvention.

How did the ancients get oil from the ground without modern drills? And build a bridge across the Rhine in just 10 days? Experts investigate.

Different cultures have used mantras and chanting for thousands of years - could these in fact be a method of communing with extraterrestrial forces.

Thousands of people from every part of the world have reported being abducted by aliens, including even a world leader - President Kiran Ilyumzhinov.

In 1969, the US government officially announced it would stop investigating UFOs, but declassified documents seem to tell another story.

Did the space race stop at just the Moon? Is there any truth to rumours of a secret Space Force developed by America for missions beyond Earth's orbit.

Dan explores the history of York's castle, from the Viking Jorvik and the Normans, to the dark days of the anti-Jewish pogrom and the imprisonment of the Knights Templar.

Hugh and the team unearth William the Conqueror's lost priory hidden beneath Lenton in Nottingham.

Ton and Allen uncover three out-of-this-world finds, including an early NASA countdown clock and a 1960s Delta Relay rocket.

Freezing Chicago throws up a 1984 snowmobile, a signed 1920s baseball glove and an authentic Robby the Robot collector toy.

Explore how ships evaded detection post-WW2 with radar, adopting shocking methods to remain hidden.

Without definitive explanations, these strange disappearances have fuelled numerous theories over time and have captured global attention.

Matty travels to the swamps of North Carolina to help a father and son excavating a mining dredge believed to contain vast riches.

What is this serpent-like creature caught on camera? And did the Nazis once colonise the South Pole.

Hours before the D-Day landing, a small group of American paratroopers were dropped behind enemy lines with a vital mission.

An elite group of British paratroopers launch a midnight raid in order to capture Hitler's unusual radar equipment.

Did a top secret group of officials, dubbed the Majestic Twelve, really create a space programme that has already established bases on the moon.

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.

Jets are scrambled to intercept a UFO, but find they are unable to complete their Shoot Down Order.

For decades, governments around the world have investigated UFO sightings. How are these top-secret studies conducted.

Dan Jones explores the 900-year history of the beautiful Leeds Castle in Kent, from its origins as a royal Saxon family's manor to a 20th-century retreat for the rich.

Hugh and the team attempt to uncover a secret World War military base on the clifftops of South Shields.

Without definitive explanations, these strange disappearances have fuelled numerous theories over time and have captured global attention.

Matty travels to the swamps of North Carolina to help a father and son excavating a mining dredge believed to contain vast riches.

What is this serpent-like creature caught on camera? And did the Nazis once colonise the South Pole.

Hours before the D-Day landing, a small group of American paratroopers were dropped behind enemy lines with a vital mission.

An elite group of British paratroopers launch a midnight raid in order to capture Hitler's unusual radar equipment.

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases.

Insects and rodents swarm supermarkets, but some food lasts forever. An unusual paint ingredient in Da Vinci's The Last Supper seals its fate.

Did a top secret group of officials, dubbed the Majestic Twelve, really create a space programme that has already established bases on the moon.

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.

Jets are scrambled to intercept a UFO, but find they are unable to complete their Shoot Down Order.

For decades, governments around the world have investigated UFO sightings. How are these top-secret studies conducted.

Dan Jones explores the 900-year history of the beautiful Leeds Castle in Kent, from its origins as a royal Saxon family's manor to a 20th-century retreat for the rich.

Hugh and the team attempt to uncover a secret World War military base on the clifftops of South Shields.

Ton and Allen face off against infamous auction hunter Chicago Charles as they bid on a Victorian-era burial casket and a hazard from the 1870s.

The guys head to a major auction, where lots include a RC Viper Fanjet aircraft, as well as a 1920s Gundlach Korona expedition camera.

Explore the human errors that condemned great ships to a tragic end, including the Vasa, a 17th century combat ship that sank on her maiden voyage.

Did a top secret group of officials, dubbed the Majestic Twelve, really create a space programme that has already established bases on the moon.

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.

On June 10, 1942, Major Georges Bergé's team landed in Crete to destroy Luftwaffe planes at Heraklion airfield. They faced a tough mission.

Ten British commandos, led by Major Hasler, leave the submarine Junon to paddle to Bordeaux and sabotage German warships.

An elite force of Norwegian resistance fighters return to their invaded homeland to carry out a daring mission.

A look at one of Scotland's most popular paid tourist attraction. With a slew of sieges to its name, it is no surprise that the site boasts some formidable defences.

Hugh and the team attempt to uncover a Roman fort, connected to Hadrian's Wall, that's buried beneath the back gardens of Benwell in Newcastle.

Another visit to the north for Alice, checking out evidence of early writing by the Picts in Scotland and a 3,000-year-old Bronze Age coffin.

To enter space, humans require a space suit. Are the aliens that are said to have visited earth any different? Or are they more akin to artificial drones.

In Spring 1952, reports of UFO sightings shot through the roof. Can former US Air Officials shed any light on this.

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.

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.

It's July 10, 1943 and the Allied Forces have evicted the Axis Powers from North Africa and can finally begin the Italian Campaign.

December 1941: Under cover of a fierce naval bombardment, a taskforce of elite British commandos sail towards the Norwegian town of South Vaagso.

Tony arrives at the most rebellious corner of England as he looks back at the Duke of Monmouth's attempt to overthrow the British monarchy.

Hugh and the team attempt to uncover a secret World War military base on the clifftops of South Shields.

When millions over the world vanish, a biblical prophecy known as the Rapture will be fulfilled. Are there signs of the prediction actually happening.

What is this serpent-like creature caught on camera? And did the Nazis once colonise the South Pole.

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.

Did a top secret group of officials, dubbed the Majestic Twelve, really create a space programme that has already established bases on the moon.

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.

Discover a real Chinese curse, a Founding Father's basement of bone and a deadly island hiding world-ending pathogens. Truth is stranger than fiction.

The exploits of pirates during the Golden Age of Piracy as they become infamous legends through heists and buried treasures still unfound.

On September 15, 1942, 12 commandos from the Special Operations Executive arrived in Northern Norway by submarine on a nearly suicidal mission.

Australia's worst aviation accident happened in 1943 when 40 crew died in a B-17 bomber crash.

Edge Of The Abyss: True stories from WWII. After surviving the Battle of the Bulge, infantryman Rockie Blunt pushes towards the Rhine and the end of the war.

As we look forward to the first astronauts reaching Mars in the next 20 years, is there evidence to suggest human life was first seeded there.

Ancient Astronaut theorists suggest that aliens have been guiding mankind in secret to bring about huge leaps in technological advancement.

On September 15, 1942, 12 commandos from the Special Operations Executive arrived in Northern Norway by submarine on a nearly suicidal mission.

During Italy's reconquest, the Allies faced the Winter Line and called in the First Special Service Force, elite troops trained for brutal terrain warfare.

On the outskirts of Bouerat Harbor in Libya, a small group of British special forces prepare to destroy a crucial German fuel depot.

Dan Jones explores the history of Cardiff castle over more than 2,000 years and reveals how it transformed into a lavish Victorian home.

Hugh and the team attempt to uncover a Viking burial ground hidden beneath Masham in North Yorkshire.

Hugh and the team unearth William the Conqueror's lost priory hidden beneath Lenton in Nottingham.

In 1969, the US government officially announced it would stop investigating UFOs, but declassified documents seem to tell another story.

Did the space race stop at just the Moon? Is there any truth to rumours of a secret Space Force developed by America for missions beyond Earth's orbit.

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.

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.

Hours before the D-Day landing, a small group of American paratroopers were dropped behind enemy lines with a vital mission.

An elite group of British paratroopers launch a midnight raid in order to capture Hitler's unusual radar equipment.

Dan explores the history of York's castle, from the Viking Jorvik and the Normans, to the dark days of the anti-Jewish pogrom and the imprisonment of the Knights Templar.

Dan Jones explores the 900-year history of the beautiful Leeds Castle in Kent, from its origins as a royal Saxon family's manor to a 20th-century retreat for the rich.

Insects and rodents swarm supermarkets, but some food lasts forever. An unusual paint ingredient in Da Vinci's The Last Supper seals its fate.

Colombia: Ross sees just how prevalent cocaine is in Colombia as he joins an army raid, before meeting the son of Gilberto Rodriguez - a founder of the Cali Cartel.

These Christian warrior monks reigned supreme for nearly 200 years. What secrets will the city of Tortosa and Jerusalem's Temple Mount reveal about the holy guardians.