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.

The story behind the breath-taking temple complex, which is located in Cambodia and is the largest religious monument in the world.

Experts investigate the US government's experiments into teleportation. They also dig into strange happenings at Mount Shasta and Skinwalker ranch.

Troy Landry chases legendary treasure hidden deep in the bayou, helped by his right-hand man Pickle Wheat and veteran hunter Don Brewer.

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.

In 2008, nearly 850 people are killed in the Russo-Georgian War. How did it erupt and what is the current relationship between the two nations.

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.

One of the greatest civilisations in the history of the Americas, the Maya thrived for over 2,000 years - but new evidence blurs our understanding.

For centuries, cultures around the world have believed in stargates through which beings have travelled to Earth - but could such portals truly exist.

There is no safe place. Every day, all around the world, in the most ordinary places, regular people are spotting UFOs.

Dan is in the heart of Snowdonia exploring a Caernarfon Castle - built not only as an impenetrable fortress but also as a lavish royal palace fit for a fairy tale.

Hugh Dennis and a team of archaeologists are in Devizes, searching for a revolutionary 19th-century prison with a unique design.

Experts investigate the US government's experiments into teleportation. They also dig into strange happenings at Mount Shasta and Skinwalker ranch.

Troy Landry chases legendary treasure hidden deep in the bayou, helped by his right-hand man Pickle Wheat and veteran hunter Don Brewer.

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.

In 2008, nearly 850 people are killed in the Russo-Georgian War. How did it erupt and what is the current relationship between the two nations.

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.

Travel to the most remote, uninhabitable parts of Earth to reveal great mysteries that have been frozen in time.

Julius Caesar: As the Roman Republic churns with civil war, Julius Caesar, desperate for fame and honour, embarks on a brutal campaign to annex Gaul and build his own reputation.

One of the greatest civilisations in the history of the Americas, the Maya thrived for over 2,000 years - but new evidence blurs our understanding.

For centuries, cultures around the world have believed in stargates through which beings have travelled to Earth - but could such portals truly exist.

These are the witnesses that have been literally touched by the unknown. Do these cases hold the answer to the central question of UFOlogy.

Dan is in the heart of Snowdonia exploring a Caernarfon Castle - built not only as an impenetrable fortress but also as a lavish royal palace fit for a fairy tale.

Hugh Dennis and a team of archaeologists are in Devizes, searching for a revolutionary 19th-century prison with a unique design.

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.

Built in 537, this is a walk-through the stunning place of worship located in Istanbul, Turkey.

Three places, three spooky stories. Experts examine weird sightings and unsolved disappearances at Bennington, Bermuda and Bridgewater triangles.

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.

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.

Soviet troops withdraw from Afghanistan in 1989 after fighting a force funded by the US. Should the US be blamed for the rise of Islamic terrorism.

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

For decades, claims of extraterrestrial presence on Earth have been made - and the government have gone to great lengths to discredit them.

For thousands of years, humankind has attempted to make contact with extraterrestrial beings from beyond Earth.

60 years on, Tony's close encounter has become an obsession. Meanwhile, pilot David presents photographic evidence of the UFO he almost crashed into whilst flying near area 51.

Stirling has long been one of the most strategically important castles in Britain. Dan Jones examines the rich and savage history of this stronghold.

Can Hugh and the team find the remains of a vanished building in the gardens of the Georgian stately home Beningbrough Hall.

Three places, three spooky stories. Experts examine weird sightings and unsolved disappearances at Bennington, Bermuda and Bridgewater triangles.

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.

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.

Soviet troops withdraw from Afghanistan in 1989 after fighting a force funded by the US. Should the US be blamed for the rise of Islamic terrorism.

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

Explore how the Axis Powers' ruthless, brutal occupation and exploitation of other countries contributed to their demise.

Exploring the impact of the Battle of Hastings in 1066, Karl and Kevin continue their look at how weapons and body armour developed.

For decades, claims of extraterrestrial presence on Earth have been made - and the government have gone to great lengths to discredit them.

For thousands of years, humankind has attempted to make contact with extraterrestrial beings from beyond Earth.

60 years on, Tony's close encounter has become an obsession. Meanwhile, pilot David presents photographic evidence of the UFO he almost crashed into whilst flying near area 51.

Stirling has long been one of the most strategically important castles in Britain. Dan Jones examines the rich and savage history of this stronghold.

Can Hugh and the team find the remains of a vanished building in the gardens of the Georgian stately home Beningbrough Hall.

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.

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

What did UFO chaser Captain Mantell see before he was killed? Plus, experts investigate a close encounter in Texas and a mysterious crash at Shag Harbour.

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.

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.

A Greenpeace ship is bombed in 1985, killing Fernando Pereira. The French authorities deny responsibility and questions over nuclear restrictions arise again.

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

Dr Jacques Vallée is best known for his work in the field of UFOs - and his bold theories challenge the notions of alien life.

Throughout ancient cultures there are tales of god-like beings helping our ancestors to build civilisations and teaching them in various disciplines.

Adam, Gwen and Julie recall personal encounters with UFOs, before experts' theories are put in doubt when we learn that each individual has time missing from their encounters.

Dan visits one of Northern Ireland's oldest castles, Carrickfergus, to learn more about the tempestuous relationship between Britain and Ireland.

Hugh and the team search for the remains of a Norman motte and bailey castle in the suburb of West Derby and uncover gems in the residents' gardens.

What did UFO chaser Captain Mantell see before he was killed? Plus, experts investigate a close encounter in Texas and a mysterious crash at Shag Harbour.

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.

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.

A Greenpeace ship is bombed in 1985, killing Fernando Pereira. The French authorities deny responsibility and questions over nuclear restrictions arise again.

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

Was Leonardo Da Vinci, one of history's great thinkers also one of its greatest prophets? And did he envision world destruction.

Declassified records reveal elite forces' extreme missions, from deep-sea divers on Soviet cables to A-bomb deployments in hostile zones.

Dr Jacques Vallée is best known for his work in the field of UFOs - and his bold theories challenge the notions of alien life.

Throughout ancient cultures there are tales of god-like beings helping our ancestors to build civilisations and teaching them in various disciplines.

Adam, Gwen and Julie recall personal encounters with UFOs, before experts' theories are put in doubt when we learn that each individual has time missing from their encounters.

Dan visits one of Northern Ireland's oldest castles, Carrickfergus, to learn more about the tempestuous relationship between Britain and Ireland.

Hugh and the team search for the remains of a Norman motte and bailey castle in the suburb of West Derby and uncover gems in the residents' gardens.

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.

A walk through the iconic mausoleum complex, located in India and commissioned in 1632 by the Mughal emperor Shah Jahan to house the remains of his beloved wife.

Experts scrutinise The Bible for evidence of alien abductions. Could extraterrestrials have been kidnapping humans for thousands of years.

A look at how ancient man could have built huge stone monoliths without advanced tools or technology. Could they have had extra-terrestrial help.

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.

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.

This is Sky History 2.

Hugh and the experts attempt to uncover a lost Roman fort connected to the Antonine Wall, buried beneath the gardens of the quiet streets of Falkirk.

Hugh Dennis and a team of archaeologists are in Devizes, searching for a revolutionary 19th-century prison with a unique design.

Dan delves into the rich past of the Tower of London, exploring inside the imposing walls that have witnessed some of the most important events in our history.

Experts scrutinise The Bible for evidence of alien abductions. Could extraterrestrials have been kidnapping humans for thousands of years.

A look at how ancient man could have built huge stone monoliths without advanced tools or technology. Could they have had extra-terrestrial help.

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.

A Great Reign Begins: Discover how, for the past few thousand years, this mighty ruler has remained a caricature of his own propaganda.

A battle worthy of Hollywood that founded the glory of Ramses II when he faces the king Muwatalli II at Qadesh.

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.

Delve into the theories that could help explain why and how the ancient Egyptians came to build the pyramids.

The Costa Del Crime: When a century-old extradition treaty between Britain and Spain ended in 1978, the Spanish Coast became a safe haven for the mafia and criminal masterminds.

Rewind to the US Army's largest and bloodiest conflict of World War II: The Battle of the Bulge. Venture through the battle in newly colourised footage.

Experts scrutinise The Bible for evidence of alien abductions. Could extraterrestrials have been kidnapping humans for thousands of years.

A look at how ancient man could have built huge stone monoliths without advanced tools or technology. Could they have had extra-terrestrial help.

Take a tour of some of the most significant breakthroughs in human history, from the digital revolution to the first aircraft to fly faster than the speed of sound.

The Executioner: Reinhard Heydrich: More than any other Nazi leader, Heydrich was an orchestrator of mass murder, and was terrifyingly clinical in approach.

The Seeds of Violence 1918-1922: In the wake of the First World War, Adolf Hitler identifies Benito Mussolini as his model and has one ultimate goal: to gain power in Germany.

The race to develop the first atomic bomb was critical amid the struggle for WWII victory. Experts reveal new evidence behind Germany's top-secret development of nuclear weapons.

Atlantis, the legendary continent that sank. As the Nazis rose to power, Himmler and the SS were convinced Atlantis existed. Season premiere.

Ancient alien experts investigate the mysterious and fearsome Norse Gods. Were they divine? Or could the all-powerful Vikings have been guided by aliens.

A look at the controversial ancient alien theories of Erich von Däniken, whose books have sold over 65 million copies worldwide.

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.

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

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

In Stretton, Hugh and the team search for prehistoric roundhouses and try to work out when people first made the Staffordshire village their home.

Can Hugh and the team find the remains of a vanished building in the gardens of the Georgian stately home Beningbrough Hall.

Dan explores the turbulent history that took place within the well-preserved walls of Warwick Castle, touching on tales of betrayal, bloodshed, murder and financial woe.

Ancient alien experts investigate the mysterious and fearsome Norse Gods. Were they divine? Or could the all-powerful Vikings have been guided by aliens.

A look at the controversial ancient alien theories of Erich von Däniken, whose books have sold over 65 million copies worldwide.

Explore the truth and lies behind ancient Egypt's best known and loved icons, including the Great Sphinx, Tutankhamun and more.

Warrior King: Discover how, for the past few thousand years, this mighty ruler has remained a caricature of his own propaganda.

When Pharaoh Ptolemy IV confronts Antiochos the Great at Raphia, that's 100,000 men from all Mediterranean clash with dramatic consequences.

The story of Cleopatra Selene, the little-known daughter of Cleopatra and Antony, who witnessed her dynasty collapse but survived to become a great queen.

Rising from the sands of the Egyptian desert is one of the ancient world's greatest wonders, the mighty Sphinx.

The 1717 wreck of Black Sam Bellamy's pirate ship Whydah yields treasure, skeletons and new insights into the hidden world of piracy.

During the Wars of the Roses, young mother Margaret Beaufort's life changes when her husband Edmund Tudor dies and she must take control of her destiny. Strong language/violence.

Ancient alien experts investigate the mysterious and fearsome Norse Gods. Were they divine? Or could the all-powerful Vikings have been guided by aliens.

A look at the controversial ancient alien theories of Erich von Däniken, whose books have sold over 65 million copies worldwide.

Treacherous Traps: Examine a variety of diabolical booby traps used to ensnare treasure hunters, outwit body snatchers or gravely harm wartime enemies.

The Waffen-SS: Masqueraded as military excellence, the reality was very different. Recruits were poorly trained and remorse was nonexistent, as SS troops killed mercilessly.

The Japanese Super Code reveals the US efforts to crack Japan's unbreakable WWII code following the horror of the attack on Pearl Harbor.

In Cyprus, a UN peacekeeper fights off deadly foe with the help of a mysterious power. Meanwhile, a strange presence is encountered at an Alaskan air force base.

A new client comes into the picture with a vintage desire, a hand built motorcycle in the vein of early Harley Davidson's, with a Full Custom twist.

Were Betty and Barney Hill really abducted by aliens? Experts investigate. They also explore the mystery of The Mothman, and Travis Walton's disappearance.

What if every human on Earth disappeared? Discover what would happen to the world we have created, including our animals, buildings, landscape and bodies.

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.

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.

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.

Deep beneath the sands of Egypt lie 24 enormous, empty sarcophagi - but what purpose might these giant tombs have served? And are they even man-made.

For over 40 years, award-winning journalist Linda Moulton Howe has covered mysterious phenomena - which could lead us to a profound new reality.

Series investigating compelling UFO and alien cases by opening previously off-limits secret files. Does the mysterious Blue Planet Project hold the answers.

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 uncover a World War Two prisoner of war camp beneath a housing estate in Oldham. Glen Mill held over six thousand enemy prisoners.

Were Betty and Barney Hill really abducted by aliens? Experts investigate. They also explore the mystery of The Mothman, and Travis Walton's disappearance.

What if every human on Earth disappeared? Discover what would happen to the world we have created, including our animals, buildings, landscape and bodies.

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.

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.

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.

Chaos ensues when the wheels literally come off a vehicle going full speed.

Jeff and the team embark on a journey in pursuit of a cache of precious gemstones. But with bad weather closing in, can they find the wreck of the Neptune.

Deep beneath the sands of Egypt lie 24 enormous, empty sarcophagi - but what purpose might these giant tombs have served? And are they even man-made.

For over 40 years, award-winning journalist Linda Moulton Howe has covered mysterious phenomena - which could lead us to a profound new reality.

Series investigating compelling UFO and alien cases by opening previously off-limits secret files. Does the mysterious Blue Planet Project hold the answers.

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 uncover a World War Two prisoner of war camp beneath a housing estate in Oldham. Glen Mill held over six thousand enemy prisoners.

New theories shed light on the world's biggest mysteries, including the unsolved disappearances of aviator Amelia Earhart and hijacker DB Cooper.

Uncover the secrets of the Holy Sepulchre, the sacred Christian site built in the same spot as the death and resurrection of Jesus.

A new and shocking theory could explain one of America's most famous unsolved crimes - the disappearance of aviator Charles Lindbergh's 20-month-old son.

What would happen to Earth if all humans vanished? Outbreak examines the possibility of escaped animals, invasive vines and a deadly virus taking over control from humans.

Explore the mystery of a sunken fleet in Maryland, weird Arctic holes that NASA cannot explain and strange structures in the desert close to Area 51.

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.

Discover the incredible story of USS Laffey, the WW2 destroyer that would come to be known as 'the ship that would not die'.

Ten archaeological finds, including mysterious spheres and a lost city, challenge our views on human origins and extraterrestrial links.

Discover the top ten mysterious monoliths, from a 500-ton stone tied to UFOs to giant statues hinting at advanced tech and visitors.

Recently declassified FBI files cast new light on the existence of aliens, as well as question whether the Vatican could be hiding proof of extra-terrestrial life.

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 solve a 17th-century mystery in King's Lynn as they hunt for defensive earthworks from the English Civil War.

A new and shocking theory could explain one of America's most famous unsolved crimes - the disappearance of aviator Charles Lindbergh's 20-month-old son.

What would happen to Earth if all humans vanished? Outbreak examines the possibility of escaped animals, invasive vines and a deadly virus taking over control from humans.

Explore the mystery of a sunken fleet in Maryland, weird Arctic holes that NASA cannot explain and strange structures in the desert close to Area 51.

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.

Discover the incredible story of USS Laffey, the WW2 destroyer that would come to be known as 'the ship that would not die'.

Soviet troops withdraw from Afghanistan in 1989 after fighting a force funded by the US. Should the US be blamed for the rise of Islamic terrorism.

Charles Peewee Goldsmith wanted nothing more than to be a Hells Angel. He fought to become a president, only for the Angels to turn on him.

Ten archaeological finds, including mysterious spheres and a lost city, challenge our views on human origins and extraterrestrial links.

Discover the top ten mysterious monoliths, from a 500-ton stone tied to UFOs to giant statues hinting at advanced tech and visitors.

Recently declassified FBI files cast new light on the existence of aliens, as well as question whether the Vatican could be hiding proof of extra-terrestrial life.

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 solve a 17th-century mystery in King's Lynn as they hunt for defensive earthworks from the English Civil War.

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.

One of the world's most popular cathedrals, Notre Dame suffered a devastating fire in 2019 - but how is it surviving today.

In 1955, a family of seven in Kentucky fired their guns on an alleged alien attack. But what did they really see.

What would happen if all humans vanished? Would LA's palm trees spark a huge inferno? What would become of New York? And which animals would take control from man.

Learn about the hunting of Jack the Ripper from space, the battle of the big guns in the land of the Bible, the clash of the mega-beasts, and a visitation from another galaxy.

After the Cuban revolution, Fidel Castro looked to exert his influence in Venezuela. Is Cuba still in charge of Venezuela's future.

Naval battles aren't always the dogfights of popular imagination. Sometimes, the real fight relied on secrets and subterfuge.

An acorn-shaped crash, a craft in Japan and a baffling impact in Britain - could these strange events prove Earth has been visited.

Explore 10 astonishing, unexplained technologies: from golden orbs in Mexico to a sacred box said to speak with the heavens.

Experts investigate why so many UFO sightings take place in Los Angeles, determining that the answer may lie underwater.

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 go on the hunt for the Morda Workhouse in Oswestry, to find out what the conditions were really like for those who lived there.

In 1955, a family of seven in Kentucky fired their guns on an alleged alien attack. But what did they really see.

What would happen if all humans vanished? Would LA's palm trees spark a huge inferno? What would become of New York? And which animals would take control from man.

Learn about the hunting of Jack the Ripper from space, the battle of the big guns in the land of the Bible, the clash of the mega-beasts, and a visitation from another galaxy.

After the Cuban revolution, Fidel Castro looked to exert his influence in Venezuela. Is Cuba still in charge of Venezuela's future.

Naval battles aren't always the dogfights of popular imagination. Sometimes, the real fight relied on secrets and subterfuge.

In the Swiss Alps, a Roman dagger discovery reveals a 2,000-year-old battlefield where the Suanetes tribe fell to the Roman Empire.

The Forest Of Death: As the Roman Empire expands its reaches into what is now Germany, its legions are faced with ferocious Germanic tribesmen.

An acorn-shaped crash, a craft in Japan and a baffling impact in Britain - could these strange events prove Earth has been visited.

Explore 10 astonishing, unexplained technologies: from golden orbs in Mexico to a sacred box said to speak with the heavens.

Experts investigate why so many UFO sightings take place in Los Angeles, determining that the answer may lie underwater.

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 go on the hunt for the Morda Workhouse in Oswestry, to find out what the conditions were really like for those who lived there.

Experts investigate the US government's experiments into teleportation. They also dig into strange happenings at Mount Shasta and Skinwalker ranch.

Discover Tikal, one of the largest and most powerful archaeological sites and urban centers of pre-Columbian Mayan civilisation.

The hunt is on for the Civil War Gold and for $1.5million taken in 1962's Plymouth Mail robbery. Plus, treasure seekers search for the Lost Dutchman mine.

If people disappeared from Earth, what would happen to metallic objects? Would bridges and buildings collapse? And what would become of the US's secret stash of gold.

Explore a shipwreck found in the middle of the desert, learn about the German aerial terror of WW1 and traverse through a ghost town still stalked by a serial killer.

In 1989, 20,000 US troops entered Panama to overthrow military dictator Manuel Noriega and around 500 civilians were killed. What prompted the invasion.

The 16th century witnessed a revolution in combat ship design and saw the birth of two legendary sea captains.

Secret agents, silenced UFO witnesses and hidden tech programs - could these mysterious projects prove contact with extraterrestrials.

From Sri Lanka's mystical portal to Washington's volcanic encounter, these peaks spark questions about possible alien connections.

Previously sealed documents hint at compelling new theories about extraterrestrials. Could aliens be living among us? And could former US Presidents know something we don't.

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 search for a monastic grange known as Biggin Hall, which provided produce for the nearby monks at St Mary's Priory.

The hunt is on for the Civil War Gold and for $1.5million taken in 1962's Plymouth Mail robbery. Plus, treasure seekers search for the Lost Dutchman mine.

If people disappeared from Earth, what would happen to metallic objects? Would bridges and buildings collapse? And what would become of the US's secret stash of gold.

Explore a shipwreck found in the middle of the desert, learn about the German aerial terror of WW1 and traverse through a ghost town still stalked by a serial killer.

In 1989, 20,000 US troops entered Panama to overthrow military dictator Manuel Noriega and around 500 civilians were killed. What prompted the invasion.

The 16th century witnessed a revolution in combat ship design and saw the birth of two legendary sea captains.

Victory in war doesn't just require sound military strategy, vital resources and equipment are also critical. Discover how the Axis powers failed in this regard.

Presenter Karl Ude-Martinez takes a tour of the weapons used during the Battle of the Somme in 1916, including machine guns and poison gas.

Secret agents, silenced UFO witnesses and hidden tech programs - could these mysterious projects prove contact with extraterrestrials.

From Sri Lanka's mystical portal to Washington's volcanic encounter, these peaks spark questions about possible alien connections.

Previously sealed documents hint at compelling new theories about extraterrestrials. Could aliens be living among us? And could former US Presidents know something we don't.

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 search for a monastic grange known as Biggin Hall, which provided produce for the nearby monks at St Mary's Priory.

Three places, three spooky stories. Experts examine weird sightings and unsolved disappearances at Bennington, Bermuda and Bridgewater triangles.

Considered one of the New Seven Wonders of the World, the Mayan City of Chichen Itza was the capital of a powerful civilisation.

Could an ex-cop have solved the mystery of Jimmy Hoffa's disappearance? Plus, experts investigate whether J F Kennedy's brain might have gone missing.

In a world void of people, pythons begin to challenge alligators for control of the Everglades. Elsewhere, Shanghai sinks under the weight of its empty skyscrapers.

Investigate an electric blue mountain and the gateway to hell, the railroad of death and the town-swallowing Texan abyss.

How will the new Cold War, involving the US, Russia, the UK and China, play out? Will trade and cyber warfare be the worst of it or is military war inevitable.

The Battle of Leyte Gulf tells the story of the largest sea conflict in history involving Pearl Harbor warships and the largest battleships in the world.

The Aztecs built one of the world's most powerful empires and they claimed that they were guided by a pantheon of more than a thousand Gods.

Luminous spheres are appearing globally, moving oddly near military sites, sparking speculation about extraterrestrial contact.

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.

Dan Jones visits Lancaster Castle to explore its grisly history of crime and punishment, including the infamous Lancashire Witches trials.

Hugh and the team search for the house of the head of the Elizabethan Secret Service, Sir Frances Walsingham, to find out what this spymaster used it for.

Could an ex-cop have solved the mystery of Jimmy Hoffa's disappearance? Plus, experts investigate whether J F Kennedy's brain might have gone missing.

In a world void of people, pythons begin to challenge alligators for control of the Everglades. Elsewhere, Shanghai sinks under the weight of its empty skyscrapers.

Investigate an electric blue mountain and the gateway to hell, the railroad of death and the town-swallowing Texan abyss.

How will the new Cold War, involving the US, Russia, the UK and China, play out? Will trade and cyber warfare be the worst of it or is military war inevitable.

The Battle of Leyte Gulf tells the story of the largest sea conflict in history involving Pearl Harbor warships and the largest battleships in the world.

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.

Declassified files reveal bizarre military programs, from atomic tests 1500x stronger than Hiroshima to plots involving Hitler.