Is there a need for us to dig up our past? What is it that we are searching for? And what secrets might remain hidden in tombs? (S3, ep 14).

The team examine incidents of alleged conflicts between the US Air Force and the RAF, and asking whether these encounters have been covered up. (S1, ep 11).

Inventor Nikola Tesla claimed to have direct communication with beings on other planets. Could this genius scientist have been a human 'receiver'? (S6, ep 14).

Count down the top ten alien petroglyphs around the world, from strange figures to flying craft and carvings of what appear to be astronauts. (S15, ep 15).

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. (6 of 6).

Explore the most notable theories into the possible whereabouts of Noah's Ark, based on ancient accounts. (S4, ep 13).

By Spring 1942, German armies had taken control, the battles of Midway and Stalingrad begin and American's achieve a ground-breaking milestone in the development of atomic weapons.

Erich von Daniken's.

December 1941: Under cover of a fierce naval bombardment, a taskforce of elite British commandos sail towards the Norwegian town of South Vaagso. (S1, ep 4).

Encouraged by Nazi brutality, Soviet Partisans took up arms, creating big 'no-go' areas for German troops. A look at their efforts from the Russian perspective. (7 of 10).

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

Delve into new discoveries being made in and around the site of Stonehenge which are reshaping the history of the 5,000-year-old prehistoric monument. (S4, ep 3).

A look at the 11,000 year old skill of a deer, a decorated Bronze Age disk and a steampunk lightbulb. (S1, ep 10).

Is the moon just a rock floating in space, or could it hold profound secrets and even possess incredible powers? Experts explore.

Rick Edwards joins YouTuber and detectorist Beau Ouimette on an underwater hunt for lost treasures linked to the ancient Vikings. (S1, ep 4).

Richard Matt and David Sweat execute one of the most daring escapes from an American prison, using manipulation and engineering smarts to help. (S1, ep 2).

More than 70 men escape Stalag Luft III, a German prisoner of war camp - but only three survive. (S1, ep 5).

Homer's The Odyssey is the most famous epic ever written - a story of a 20-year journey to return home from war. But could it actually have happened? (S1, ep 6).

Throughout the world, ancient objects have been found that leave archaeologists at a loss. What do they reveal about the world we live in today? (S12, ep 40).

Erich von Daniken's.

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. (6 of 6).

It's July 10, 1943 and the Allied Forces have evicted the Axis Powers from North Africa and can finally begin the Italian Campaign. (S1, ep 3).

Some are capable of the impossible, whether it be surviving freezing temperatures or lifting huge, weighty objects, but how do they do it? (S3, ep 16).

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. (S1, ep 1).

Ancient Astronaut Theorists investigate how ancient aliens may have helped to guide and define mankind in the remote past. (S6, ep 15).

In the 1900s, a modern-day prophet Edgar Cayce became a worldwide sensation. He claimed to receive visions of both the past and future. (S15, ep 16).

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. (S1, ep 1).

Delve into the top theories surrounding the case of Dan Cooper, who hijacked a Northwest Orient Airlines flight, before disappearing without a trace. (S4, ep 14).

1943 begins with the Casablanca Conference. Events unfold in the week of the Soviet victory in Stalingrad, and one of the best-selling songs in history is released. (S1, ep 5).

Following a 2017 public disclosure of secret government UFO investigations, are we any closer to proving there has been a UFO conspiracy? (S11, ep 1).

Hours before the D-Day landing, a small group of American paratroopers were dropped behind enemy lines with a vital mission. (S1, ep 5).

A gripping look from the Russian perspective at the amazing World War II intelligence coups pulled off by the USSR - a nation obsessed with secrecy and espionage. (8 of 10).

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

In 2004, the decapitated remains of over 80 skeletons were found in York. With the help of experts, learn the truth about this macabre discovery. (S4, ep 4).

Uncovering the mystery of an ancient stone object with unique markings and a cat mummy with no cat inside. (S2, ep 1).

Through stories of mind-blowing robberies, this episode examines what motivates someone to steal. (S2, ep 8).

Rick Edwards joins YouTuber and detectorist Beau Ouimette on an underwater hunt to discover the secrets of Hadrian's Wall. (S1, ep 5).

From the ancient Babylonian's to modern day urban explorers, mankind has always been fascinated by abandoned places. (S3, ep 11).

Is the legend of King Arthur and its impact on Western culture testament to the power of myth? Or was it nothing more than a mixture of cultures? (S3, ep 19).

Death in Deptford: Experts investigate the strange circumstances surrounding the death of Shakespeare mentor and fellow playwright Christopher Marlow. (S1, ep 1).

It's believed the Knights Templar owned vast swathes of land, commanded fleets, and lent money to kings. How do we separate the facts from the fiction? (S1, ep 1).

Following a 2017 public disclosure of secret government UFO investigations, are we any closer to proving there has been a UFO conspiracy? (S11, ep 1).

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. (S1, ep 1).

December 1941: Under cover of a fierce naval bombardment, a taskforce of elite British commandos sail towards the Norwegian town of South Vaagso. (S1, ep 4).

Today, humanity spans the globe, but how did our species evolve? Do other human-like creatures still exist today? (S3, ep 17).

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. (S1, ep 2).

Biblical texts describe winged creatures carrying messages from the heavens. But are angels merely the product of the imagination - or do they really exist? (S2, ep 8).

Could aliens have helped humans build huge ancient structures? Experts ask whether standing stones in France, were a GPS system for ancient spacecraft. (S2, ep 9).

Could aliens have already landed on Earth? Experts visit the Texas cemetery believed to hold the body of a life form that crashed there in 1897. (S3, ep 1).

The Luftwaffe's Frontline Fighter: The astonishing story of the 109 and its modified variants, best known for its role in the Battle of Britain. (3 of 6).

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

James Nesbitt examines the Piper Alpha oil platform explosion of 1988, one of the most devastating man-made catastrophes to date. (S1, ep 3).

The tragic story of the 1958 Munich air crash, which claimed 23 lives, including those of eight Manchester United footballers. (S1, ep 4).

Richard Matt and David Sweat execute one of the most daring escapes from an American prison, using manipulation and engineering smarts to help. (S1, ep 2).

More than 70 men escape Stalag Luft III, a German prisoner of war camp - but only three survive. (S1, ep 5).

Rick Edwards joins YouTuber and detectorist Beau Ouimette on an underwater hunt for lost treasures linked to the ancient Vikings. (S1, ep 4).

Presenter Rick Edwards and US YouTube sensation and river detectorist Beau Ouimette travel to Warwick on the hunt for incredible archaeological finds. (S1, ep 2).

Discover the desert ghost town of untold riches and unspeakable horrors, the lost empire of South America and hear mystery noises that haunt a city. (S5, ep 13).

Explore Ragnarok and the chambers of horror, see the penguin apocalypse and attack of the mega-mice and catch a family holiday - North Korean style. (S5, ep 14).

Check out the best moments, milestones and highlights from some of the most epic treasure quests around the globe. (S2, ep 10).

Join Dan Aykroyd as he takes a look at some of the strangest weapons ever, from 'bat bombs' and war dolphins to inflatable tanks. (S1, ep 4).

From a headless chicken that lives for over a year to an out-of-this-world 'celestial body', discover some of history's most fascinating bodies. (S1, ep 3).

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

From Flight MH370 to a series of vanishings in the Bermuda Triangle, this is a look at some of the most compelling and perplexing cases of disappearance.

A look at the stories of UFO witnesses Betty Cash and Vickie Landrum, Scottish hacker Gary McKinnon, ex-musician Tom Delonge and John Podesta. (S1, ep 4).

Throughout the world, ancient objects have been found that leave archaeologists at a loss. What do they reveal about the world we live in today? (S12, ep 40).

The mysterious keyhole symbol exists in mystic texts, sacred architecture and artwork found around the globe. Is there more to it than meets the eye? (S12, ep 38).

On 6 March 1987, the ferry Herald of Free Enterprise capsized, resulting in the deaths of 193 passengers and crew. (S1, ep 2).

James Nesbitt explores some of Britain's most tragic disasters, starting with the 1999 rail accident at Ladbroke Grove in London. (S1, ep 1).

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

A DNA study released in 2018 revealed that the original builders of Stonehenge mysteriously vanished - did they head back to a home among the stars? (S12, ep 16).

Could aliens have given our brains incredible untapped abilities? Experts ask whether harnessing these hidden powers could spark the next step in our evolution. (S12, ep 17).

Experts question the link between divine substances and extraterrestrials. Could the food of the gods really have been sustaining Earth's alien visitors? (S12, ep 18).

The four-part series charting the life story of Winston Churchill begins with a look at the early beginnings of his career. (1 of 4).

The story continues with a look at his time as Prime Minister of the United Kingdom, a time where his notable speeches were born. (2 of 4).

Walt Disney overcomes obstacles to create the first theme park, where instead of thrill rides, the visitor enjoys an immersive journey into a story. (S1, ep 3).

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

With the help of modern science, uncover the secrets of health and wealth in Ancient Egypt from Queen Hatshepsut's death to a case of breast cancer. (S1, ep 5).

Scientists and historians join forces to investigate whether colossal volcanoes toppled an ancient dynasty and reveal the true face of an ancient mummy. (S1, ep 6).

River detectorist turned YouTube sensation Beau Ouimette and presenter Rick Edwards search for underwater archaeological finds tied to the Civil War. (S1, ep 3).

Rick Edwards joins YouTuber and detectorist Beau Ouimette on an underwater hunt to discover the secrets of Hadrian's Wall. (S1, ep 5).

Today, humanity spans the globe, but how did our species evolve? Do other human-like creatures still exist today? (S3, ep 17).

Humans are capable of surviving catastrophic injuries, but is cheating death when survival is impossible fate or good fortune? (S3, ep 18).

Two skilled thieves go after New York's Pierre Hotel. The team take over the hotel, getting into the lobby vault and hundreds of safe deposit boxes. (S1, ep 3).

A clued-up mafia crew attempt an ambitious airline heist at JFK International Airport. Those involved disappeared and met their fate in the aftermath. (S1, ep 4).

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. (S1, ep 9).

The story of Hitler's dysfunctional home life. His parents were closely related, and in his adult years, he was rumoured to have engaged in incest himself. (3 of 4).

Tony examines some of the most compelling evidence of UFOs and wormholes at the Bermuda Triangle and analyses similar discoveries across the globe. (S1, ep 6).

A look at some of the most devastating plagues in human history, and the scientific advances that helped to combat these diseases.

Could aliens have already landed on Earth? Experts visit the Texas cemetery believed to hold the body of a life form that crashed there in 1897. (S3, ep 1).

Experts explore a Hindu scripture describing a huge flying creature that landed on Earth. Could this monster have been an alien craft from outer space? (S3, ep 2).

A look at the Petrozavodsk incident of 1977 - one of the key moments that helped to determine the official Soviet response to the UFO phenomenon. (S1, ep 5).

Explore how, despite repeated denials, the significance of UFO sightings could have been analysed and discussed at the highest levels of government. (S1, ep 6).

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

Experts question what the God Particle reveals about the origin of our world and whether clues to its significance could have been left by ancient aliens. (S6, ep 16).

Biblical texts describe winged creatures carrying messages from the heavens. But are angels merely the product of the imagination - or do they really exist? (S2, ep 8).

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. (S1, ep 2).

The mysterious arrangement of stones found in the English countryside remains a mystery as to how - or why - the landmark was built. (S4, ep 15).

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

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

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

An elite group of British paratroopers launch a midnight raid in order to capture Hitler's unusual radar equipment. (S1, ep 6).

Soviet troops enter Berlin and begin to carry out their own terrible retribution against the German people. A look from the Russian perspective. (9 of 10).

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

The team investigate whether the biblical tale of the ten plagues of Egypt could be explained by a volcanic eruption and its resulting domino effect. (S4, ep 5).

Investigating how a skull changed neuroscience and asking if World War II could have been won by a bat. (S2, ep 2).

A cow is mutilated, a man is repeatedly abducted from his bed, and an astronomer's telescope intercepts a mysterious message. (S2, ep 1).

Rick and Beau discover a variety of intriguing items as they search the rough waters of the River Tees for lost Tudor relics. (S1, ep 6).

A crew described by the FBI as.

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

Kru chases down a taped conversation with a man claiming to have found Slumach's gold deposit. Taylor attempts to decipher an old map. (S1, ep 5).

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. (1 of 3).

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

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

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. (S1, ep 2).

Hours before the D-Day landing, a small group of American paratroopers were dropped behind enemy lines with a vital mission. (S1, ep 5).

Humans are capable of surviving catastrophic injuries, but is cheating death when survival is impossible fate or good fortune? (S3, ep 18).

Two cousins encounter a.

Dozens of witnesses report seeing a fiery object falling through the Pennsylvania sky in 1965. In 1997, Phoenix residents claim to spot boomerang-shaped UFOs above their homes. (S1, ep 2).

Series examining 75 million years of alien evidence on Earth. Discover what secrets extraterrestrials may have left behind and how spacemen might have shaped our world. (S2, ep 1).

Investigation into whether advanced technologies such as lasers and sonic weapons are merely rediscovered tools used by advanced beings in the past. (S2, ep 6).

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. (S1, ep 3).

There have been thousands of alleged sightings of Bigfoot across the US, but despite growing evidence, the creature has never been officially identified. (S4, ep 16).

It's spring 1944 and on the Eastern Front, the momentum is firmly with allies as the war moves into its final, violent act. (S1, ep 7).

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

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

The four-part series charting the life story of Winston Churchill begins with a look at the early beginnings of his career. (1 of 4).

A look from the Russian perspective at the Red Army's assault on Japanese-occupied Manchuria, which fell on the same day a second nuclear attack hit Japan. (10 of 10).

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

With the help of a team of scientists and anthropologists, learn about the ancient craft of shrunken heads and the culture of the tribe that made them. (S4, ep 6).

Exploring the origin of a death mask, three carvings which could shed light on Stonehenge and a plate found in Austria. (S2, ep 3).

Decoding Mayan texts, a physicist predicts a cataclysm will destroy the world. A NASA scientist makes an alien discovery. (S2, ep 4).

Rick and Beau head to the beautiful River Wear, a natural fortress that protects the ancient city of Durham, and discover some intriguing relics from the 1200s. (S1, ep 7).

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

For years Disney has pushed the boundaries of art and science through the work of dreamers, designers and builders known as the 'Imagineers'. (S1, ep 6).

Examine an ancient pyramid toolkit, a device that unleashes lethal X-rays and a divisive terracotta sculpture. (S2, ep 6).

Mysterious industrial waste is discovered in an uninhabited part of Greenland. Meanwhile, strange mounds are found deep within the Arctic Circle. (S3, ep 7).

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

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

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. (S1, ep 3).

An elite group of British paratroopers launch a midnight raid in order to capture Hitler's unusual radar equipment. (S1, ep 6).

Is the legend of King Arthur and its impact on Western culture testament to the power of myth? Or was it nothing more than a mixture of cultures? (S3, ep 19).

On a country Texas road in 1980, a diamond-shaped UFO melts a vehicle below. In 1967, a man in Manitoba encounters a flying disc and reports hearing voices inside. (S1, ep 3).

A Japanese airline crew in 1986 encounter two UFOs en route from Paris to Tokyo. In 1979, a man in Minnesota skids off the road after a mysterious beam of light engulfs his car. (S1, ep 4).

Why do many cultures tell similar tales of monsters and giants? Could they be eye-witness accounts of extraterrestrials? Series exploring evidence of aliens. (S2, ep 2).

Could aliens have helped humans build huge ancient structures? Experts ask whether standing stones in France, were a GPS system for ancient spacecraft. (S2, ep 9).

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. (S1, ep 4).

For centuries, explorers put their lives on the line searching for the legendary ancient city of El Dorado, but will anyone ever find it? (S4, ep 17).

By January 1945, it seemed the end of the war was in sight - but challenges still loomed on the Eastern Front, in the Pacific and in Western Europe. (1 of 8).

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

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

The story continues with a look at his time as Prime Minister of the United Kingdom, a time where his notable speeches were born. (2 of 4).

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.

The team examine incidents of alleged conflicts between the US Air Force and the RAF, and asking whether these encounters have been covered up. (S1, ep 11).

Modern forensic techniques reveal new secrets about a morbid collection of 2,300-year-old corpses found in northern Europe. (S4, ep 7).

Investigate a machine which can supposedly read personalities, a mask painted with human blood and a cursed pot. (S2, ep 4).

While hiking a woman has a terrifying encounter with an entity from another world. (S2, ep 5).

It's the River Avon for Rick and Beau's final stop of the series, where they stumble upon some Roman coins in their search for William the Conqueror's legacy. (S1, ep 8).

Dan Aykroyd delves into some of history's strangest inventions, from a full-body gas mask for babies to a robot powered by eating slugs. (S1, ep 5).

Discover some of history's strangest rituals, from human bones being used as a 'miracle cure' for gout to human mummies being buried alive. (S1, ep 7).

A deadly shockwave hurtles towards a terrified driver. An alien signal rises from a deep ocean abyss, and a bizarre glowing orb swoops along a remote forest road. (S1, ep 9).

Atlantis, the legendary continent that sank. As the Nazis rose to power, Himmler and the SS were convinced Atlantis existed. Season premiere. (S1, ep 1).

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

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

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. (S1, ep 4).

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. (S1, ep 1).

William Shatner digs deep into our ancient past to discover our predecessors' epic feats of engineering, from the remarkable to the inexplicable. (S3, ep 20).

In 1966, a class of Melbourne students spot a UFO and are told never to speak of the incident. A man's car dies in 2009 after he spots a cigar-shaped object in the New York sky. (S1, ep 5).

A teenager sees a mushroom-shaped object appear in the field while feeding his sheep in 1971. In 2000, police officers in Illinois chase a triangular UFO the size of a house. (S1, ep 6).

From Mexico's mystifying Zone of Silence, to Markawasi Plateau in Peru, known for its frequent UFO sightings, were these the homes of ancient aliens? (S2, ep 3).

For millennia, people have believed that everyday objects can possess hidden energy. These talismans are seen to provide protection and good fortune. (S15, ep 20).

Stirling has long been one of the most strategically important castles in Britain. Dan Jones examines the rich and savage history of this stronghold. (S1, ep 5).

Explore the top theories behind what caused the unexplained illnesses in US diplomats in 2017, later known as 'The Havana Syndrome'. (S4, ep 18).

If aliens came calling, who would speak on behalf of humans? Discover what protocols exist should extraterrestrials contact Earth. (S1, ep 5).

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

Churchill must make crucial decisions and figure out how to navigate big changes as the war rages on and Britain makes a powerful ally. (3 of 4).

The troubled beginnings and amazing exploits of the legendary British heavy bomber. Plus, see a replica up close. (1 of 6).

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. (S1, ep 1).

Learn about the discovery of an 11,000-year-old stone monument which may hold the secret to the location of the Garden of Eden. (S4, ep 8).

Examine claims Nostradamus predicted Hitler. Plus, learn about the canary resuscitator and a tiny object with the power to kill. (S2, ep 5).

A small community is devastated by an earth-shattering 'boom,' while an paranormal fog seems to alter the very fabric of time. (S2, ep 6).

The team find evidence from one of Scotland's bloodiest eras as they wade through the waters of the River Garry in the stunning Scottish Highlands. (S2, ep 1).

Mastermind Nuno Pontes leads six men to escape Pittsburgh State Penitentiary by tunnelling the under the wall. However, their freedom is short-lived. (S1, ep 4).

HM Maze prison was a notorious lock up for IRA prisoners in Ireland. A small ring of them secretly planned what they hoped would be a massive prison break. (S1, ep 6).

His epic battles with Grendel and his mother have made Beowulf the Viking world's most famous warrior. But could this mythological hero have been based on a real person? (S1, ep 1).

If aliens came calling, who would speak on behalf of humans? Discover what protocols exist should extraterrestrials contact Earth. (S1, ep 5).

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

Stirling has long been one of the most strategically important castles in Britain. Dan Jones examines the rich and savage history of this stronghold. (S1, ep 5).

Between September 1940 and November 1941, things intensify as Nazi Germany exert their dominance over Europe. (S1, ep 2).

While hiking a woman has a terrifying encounter with an entity from another world. (S2, ep 5).

In 1980, soldiers encounter a luminous craft and dancing red lights in Suffolk. Witnesses report a metallic UFO hovering over water and crashing in Nova Scotia in 1967. (S1, ep 7).

A silent football-shaped object causes grave concern when it's spotted in Maine in 1975. In 1946, a UFO crashes and causes a deafening explosion as it crashes in northern Sweden. (S1, ep 8).

Could aliens have told Joan of Arc how to beat the English army? And could a US serviceman have received a message when he touched a spaceship? (S2, ep 4).

Explore whether the Gods of Greece including Zeus, Apollo and Poseidon, were actually extra-terrestrial visitors to Earth. (S15, ep 18).

Dan visits one of Northern Ireland's oldest castles, Carrickfergus, to learn more about the tempestuous relationship between Britain and Ireland. (S1, ep 6).

Explore the top theories behind why the ancient Peruvians built the Nazca Lines. (S4, ep 19).

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.

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

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

Churchill's - and Britain's - influence begins to shrink as the Soviet Union and the United States grow into the most significant actors in the war. (4 of 4).

A look at the later, clipped wing version flown by Czech refugee pilots in the UK during World War II. Plus, a tour of a restored example. (2 of 6).

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. (S1, ep 2).

ISIS detonate explosives under Jonah's tomb, revealing an ancient temple complex. The findings tell the story of a despot, a fertility cult and much more. (S5, ep 1).

Examine an ancient pyramid toolkit, a device that unleashes lethal X-rays and a divisive terracotta sculpture. (S2, ep 6).

A girl finds a 1000-year-old skull that may prove aliens once walked the planet, and ancient stone carvings could rewrite the story of evolution. (S2, ep 10).

Rick and Beau embark on an epic search through the River Ouse in Yorkshire, in a bid to find evidence of Viking life. (S2, ep 2).

William Shatner digs deep into our ancient past to discover our predecessors' epic feats of engineering, from the remarkable to the inexplicable. (S3, ep 20).

Find the billion-dollar horde buried deep beneath the deserts of Utah, discover the massacre so horrific it was captured from space and see the ice cave of the Norse fire God. (S5, ep 16).

Experts investigate the mysterious demise of Edward II of England, who was held in custody by his wife and a group of barons. (S1, ep 2).