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.

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.

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

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

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.

In 1944, two Wellington bombers collided in mid-air over Northants. Garth Barnard investigates why 13 young trainees perished.

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.

While modern science has stopped many viruses and bacteria in their tracks, there is a growing concern that contagious germs could be travelling through space.

Rick, Tony and Matty join Barry join the search for artefacts and treasure connected to the Whydah shipwreck off the coast of Cape Cod.

Is a video leak more evidence that UFOs really exist? And does footage prove that Sasquatch is no myth.

Two iconic machines of World War II - the Spitfire symbolised British hope and resistance, while the Tiger tank embodied German power.

The Vietnam war changed aerial warfare in more ways than one. The Phantom became the first true fighter bomber of the modern era.

Experts question if Cloud computing represents the rediscovery of an ancient repository of knowledge known as the Akashic Record.

Beyond Nazca: Giorgio Tsoukalos draws on evidence from past series as he takes an in-depth look at the mystery of Southern Peru's Nasca Lines.

Those who claim to have been abducted by extraterrestrials give their accounts of the interior of their spacecrafts.

If aliens have visited Earth, what are their intentions? Do they wish to experiment on the human body, or the human mind as well.

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 a Roman settlement under the back gardens of Florence Road in Maidstone, Kent.

While modern science has stopped many viruses and bacteria in their tracks, there is a growing concern that contagious germs could be travelling through space.

Rick, Tony and Matty join Barry join the search for artefacts and treasure connected to the Whydah shipwreck off the coast of Cape Cod.

Is a video leak more evidence that UFOs really exist? And does footage prove that Sasquatch is no myth.

Two iconic machines of World War II - the Spitfire symbolised British hope and resistance, while the Tiger tank embodied German power.

The Vietnam war changed aerial warfare in more ways than one. The Phantom became the first true fighter bomber of the modern era.

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.

Thomas Wintour hears there has been an explosion at Holbeche House and rushes back to find a scene of devastation, with many of the men defecting.

Experts question if Cloud computing represents the rediscovery of an ancient repository of knowledge known as the Akashic Record.

Beyond Nazca: Giorgio Tsoukalos draws on evidence from past series as he takes an in-depth look at the mystery of Southern Peru's Nasca Lines.

Those who claim to have been abducted by extraterrestrials give their accounts of the interior of their spacecrafts.

If aliens have visited Earth, what are their intentions? Do they wish to experiment on the human body, or the human mind as well.

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 a Roman settlement under the back gardens of Florence Road in Maidstone, Kent.

Ton and Allen have a blast when they strike gold with a dynamite detonator box. Plus, a 1890s treasure chest reveals secret compartments.

A bidding war hands Ton and Allen a Winchester Model 1912 and a hunter's collection of big game, full-body taxidermy.

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

Bible relics are investigated to verify if they provide physical evidence for biblical events and miracles.

Matty goes blackwater river diving in search of the legendary Revolutionary War treasure of British army officer Charles Cornwallis.

Is a dead mermaid really preserved in Japan? And are UFOs attracted to nuclear facilities.

Icons of the Royal Navy in different eras, the Belfast and the Harrier have earned their place in history for different reasons.

Two of the most produced combat machines in World War II managed to stay relevant until the end of the war through constant modernization and new variants.

Do India's Sanskrit texts, with their descriptions of advanced technology, lend themselves to the theory that aliens once walked amongst us.

The Monoliths: Giorgio Tsoukalos takes a closer look at the evidence as he asks whether Earth's stone monoliths were built with extra terrestrial help.

Alien encounters have offered a possible glimpse into the secrets of interstellar navigation. Could this one day ensure mankind's survival.

Advances in technology have given us unprecedented access to distant galaxies that may harbour life. However, alien life may be found closer to home.

Dan explores the history of the Earls of Arundel, how knights fought in the Hundred Years' War and how the Castle would have prepared for Queen Victoria's 1846 visit.

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.

Bible relics are investigated to verify if they provide physical evidence for biblical events and miracles.

Matty goes blackwater river diving in search of the legendary Revolutionary War treasure of British army officer Charles Cornwallis.

Is a dead mermaid really preserved in Japan? And are UFOs attracted to nuclear facilities.

Icons of the Royal Navy in different eras, the Belfast and the Harrier have earned their place in history for different reasons.

Two of the most produced combat machines in World War II managed to stay relevant until the end of the war through constant modernization and new variants.

Revelation is the most terrifying book in the Bible, describing mankind's final days. But who will survive God's wrath? And when will it happen.

In 1994, a secret manuscript hidden in the Vatican revealed a previously unknown apocalyptic prophecy accredited to Nostradamus. Where did it come from.

Do India's Sanskrit texts, with their descriptions of advanced technology, lend themselves to the theory that aliens once walked amongst us.

The Monoliths: Giorgio Tsoukalos takes a closer look at the evidence as he asks whether Earth's stone monoliths were built with extra terrestrial help.

Alien encounters have offered a possible glimpse into the secrets of interstellar navigation. Could this one day ensure mankind's survival.

Advances in technology have given us unprecedented access to distant galaxies that may harbour life. However, alien life may be found closer to home.

Dan explores the history of the Earls of Arundel, how knights fought in the Hundred Years' War and how the Castle would have prepared for Queen Victoria's 1846 visit.

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.

One of the US's oldest storage facilities throws up a heap of unusual items, including an 1800s whaling harpoon and a Betsy Ross American flag.

Allen and Ton score a World War II Stuart M3 tank barrel and heavy-duty tank treads. In the ultimate deli unit, they discover a gigantic meat slicer.

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

Scientists have forever been involved in a quest to understand the universe. But for each answer science provides, more questions arise.

Marty and Matty help investigate a mysterious island where a notorious English pirate is believed to have hidden plundered treasure.

Did a fisherman capture footage of a giant sea serpent? What were the lights that appeared above Texas in 1951.

The Soviet Union produced a large variety of tanks and airplanes during World War II. What made the T34 and the Chaika stand out and become icons.

Found in a scrapyard in 2015, the C-47 aircraft that led the D-Day landings was reconstructed for a transatlantic mission to honour the fallen. This is its incredible story.

Going by ancient cultures' depictions of gods appearing as animals, could it be that extraterrestrials bear more resemblance to animals than humans.

The Tesla Experiment. Giorgio A Tsoukalos draws on evidence from past series as he asks whether Nikola Tesla was communicating with extraterrestrials.

As the world continues to evolve into the digital age, more and more people are capturing images in the sky that they are unable to explain.

For years many have argued that UFOs are as terrestrial as you or I. They may be correct, but not in the way they thought they were.

Dan ventures behind the battlements of Dover Castle, exploring the underground lairs and a vast network of tunnels that have been used to defend the country for centuries.

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

Scientists have forever been involved in a quest to understand the universe. But for each answer science provides, more questions arise.

Marty and Matty help investigate a mysterious island where a notorious English pirate is believed to have hidden plundered treasure.

Did a fisherman capture footage of a giant sea serpent? What were the lights that appeared above Texas in 1951.

The Soviet Union produced a large variety of tanks and airplanes during World War II. What made the T34 and the Chaika stand out and become icons.

Found in a scrapyard in 2015, the C-47 aircraft that led the D-Day landings was reconstructed for a transatlantic mission to honour the fallen. This is its incredible story.

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.

The mega-rich love to display their wealth by acquiring flashy vehicles and the ancients were no different, whether it be chariots, horse-drawn carriages or boats.

All wealthy people have the resources to create their ideal home, but these industrial tycoons weren't content with building just one single house.

Going by ancient cultures' depictions of gods appearing as animals, could it be that extraterrestrials bear more resemblance to animals than humans.

The Tesla Experiment. Giorgio A Tsoukalos draws on evidence from past series as he asks whether Nikola Tesla was communicating with extraterrestrials.

As the world continues to evolve into the digital age, more and more people are capturing images in the sky that they are unable to explain.

For years many have argued that UFOs are as terrestrial as you or I. They may be correct, but not in the way they thought they were.

Dan ventures behind the battlements of Dover Castle, exploring the underground lairs and a vast network of tunnels that have been used to defend the country for centuries.

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

Allen and Ton uncover an 1886 rifle invented to kill buffalo. Then they head to the monster track to test 1950s electric slot cars.

Allen and Ton come up against Texas's most elite buyers as they discover a military-grade cruise missile jet engine and a Wild West saddle.

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

For centuries, tales of terrifying monsters have fascinated mankind. Get to know the beasts that have been portrayed in some of history's classic stories.

Matty and Tony re-join the excavation of the Whydah wreckage with Barry and his team in Cape Cod, near a graveyard of sunken cannons.

In this special, Tony Harris reviews the latest developments and most compelling photographic evidence from a tumultuous year of UFO revelations.

Engine problems threaten the restoration, and emotions run high as residents from Greenham Common - where the plane took off from the UK - remember seeing it in its glory.

The restoration is complete and relatives of the original crew share their incredible stories as they board the aircraft. Will it survive a gruelling voyage over the Atlantic.

While many believe in reincarnation, experts suggest that extraterrestrials designed the human body to be a vessel for otherworldly beings.

Alien Power Plants: Giorgio Tsoukalos draws on evidence from past series as he asks whether aliens introduced the Greeks and Egyptians to electricity.

In 1947, there was an unprecedented wave of UFO sightings that propelled the UFO phenomenon to the world stage. What were the US Air Force's findings.

For many people, the most credible UFO reports are those raised by law enforcement. We investigate the most significant reports from police records.

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.

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

For centuries, tales of terrifying monsters have fascinated mankind. Get to know the beasts that have been portrayed in some of history's classic stories.

Matty and Tony re-join the excavation of the Whydah wreckage with Barry and his team in Cape Cod, near a graveyard of sunken cannons.

In this special, Tony Harris reviews the latest developments and most compelling photographic evidence from a tumultuous year of UFO revelations.

Engine problems threaten the restoration, and emotions run high as residents from Greenham Common - where the plane took off from the UK - remember seeing it in its glory.

The restoration is complete and relatives of the original crew share their incredible stories as they board the aircraft. Will it survive a gruelling voyage over the Atlantic.

Follow the tale of the strongest superhero in Greek mythology and his quest for redemption: a series of impossible challenges to atone for a heinous crime.

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.

While many believe in reincarnation, experts suggest that extraterrestrials designed the human body to be a vessel for otherworldly beings.

Alien Power Plants: Giorgio Tsoukalos draws on evidence from past series as he asks whether aliens introduced the Greeks and Egyptians to electricity.

In 1947, there was an unprecedented wave of UFO sightings that propelled the UFO phenomenon to the world stage. What were the US Air Force's findings.

For many people, the most credible UFO reports are those raised by law enforcement. We investigate the most significant reports from police records.

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.

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

In the industrial hub of Los Angeles, Ton and Allen unearth a 1981 Bobcat 743 Frontloader and a trench-defending helmet-bashing mace from World War I.

The guys land a 1970s Z-Flex Jimmy Plumer Poolrider skateboard with artwork by Doug Smith and a Kevlar bulletproof vest and helmet used by SWAT teams.

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.

For centuries there have been legends of vast treasures hidden across the US. Are they just tall tales or are these valuables waiting to be found.

Joined by companion Matty, brothers Rick and Marty Lagina look back on their richest adventures stretching back over the previous year.

What causes the thunderous banging noises that wake Thessaloniki residents every night.

A look at the creation of the super marine Spitfire, an amazing feat of engineering that became one of the most famous fighter aircrafts in the Battle of Britain.

During World War II, British warships were struck by a secret weapon invented by the Italian Navy - the 'human torpedo'. Hear the full story, from disastrous missions to ultimate success.

The Ishi-no-Hoden megalith in Japan was supposedly built to depict an ancient flying ship. Could this have been an ancient alien vessel.

The Mystery of Puma Punku. Experts in the extra-terrestrial examine the Inca ruin and its mysteriously intricate carved blocks.

Between 1981 and 2011, cameras on NASA space shuttles have picked up many images of UFOs that experts still struggle to explain.

While many UFO sightings occur in rural locations with only a single eyewitness, there have been sightings over cities witnessed by hundreds.

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.

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

For centuries there have been legends of vast treasures hidden across the US. Are they just tall tales or are these valuables waiting to be found.

Joined by companion Matty, brothers Rick and Marty Lagina look back on their richest adventures stretching back over the previous year.

What causes the thunderous banging noises that wake Thessaloniki residents every night.

A look at the creation of the super marine Spitfire, an amazing feat of engineering that became one of the most famous fighter aircrafts in the Battle of Britain.

During World War II, British warships were struck by a secret weapon invented by the Italian Navy - the 'human torpedo'. Hear the full story, from disastrous missions to ultimate success.

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

A massive force of water threatens to destroy everything, from famous paintings to whole cities. The fate of the Sydney Opera House looks bleak.

The Ishi-no-Hoden megalith in Japan was supposedly built to depict an ancient flying ship. Could this have been an ancient alien vessel.

The Mystery of Puma Punku. Experts in the extra-terrestrial examine the Inca ruin and its mysteriously intricate carved blocks.

Between 1981 and 2011, cameras on NASA space shuttles have picked up many images of UFOs that experts still struggle to explain.

While many UFO sightings occur in rural locations with only a single eyewitness, there have been sightings over cities witnessed by hundreds.

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.

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

Ton and Allen score a knock-out as Hollywood hands them an autographed Raging Bull poster and a rare 1870s knuckle-duster.

The guys strike gold with a 1970s El Toro mechanical bull used to train riders, a silver World War II-era banjo, and a collection of 1800s duck decoys.

Specialized landing craft built to go where no other combat ship can reach and able to deliver tanks, jeeps, soldiers and supplies to the front lines.

Experts investigate why so many UFOs have been spotted near remote islands. Could these far-removed spots be the earthly homes of aliens.

Beyond Nazca: Giorgio Tsoukalos draws on evidence from past series as he takes an in-depth look at the mystery of Southern Peru's Nasca Lines.

Japan expands in Asia and Africa's colonies become key battlegrounds for power and resources.

In 1941, Hitler invaded the USSR. Operation Barbarossa stalls as winter hits and Soviet resistance, fuelled by propaganda, turns the tide.

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.

Deceit and Delusion 1923-1928: Hitler appears to be eliminated after his failed putsch in 1923. Discover how the Nazi movement used democracy's tolerance in Germany to come back.

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.

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.

A look at the first weeks of a war that would disrupt the lives of so many, starting with the first shots fired by the Japanese in July 1937, China.

The story of the World War II aircraft carrier USS Enterprise. Join her as she sets sail in the Pacific on a mission to sink enemy submarines.

Amazing CGI graphics tell the story of how the USS Enterprise and sister carriers Yorktown and Hornet turned the tide of the Pacific battle during WWII.

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.

Deceit and Delusion 1923-1928: Hitler appears to be eliminated after his failed putsch in 1923. Discover how the Nazi movement used democracy's tolerance in Germany to come back.

We are at War: The German invasion of Poland starts and Jews face segregation. Mussolini allies with Hitler, Churchill is appointed UK PM and Germany invades France.

Revelation is the most terrifying book in the Bible, describing mankind's final days. But who will survive God's wrath? And when will it happen.

What causes the thunderous banging noises that wake Thessaloniki residents every night.

The Mad King of Bavaria: Explore the controversy surrounding the death of the eccentric King Ludwig, whose unstable behaviour saw him deposed.