Condottiere - Italy's Dogs of War: Delve into medieval Italian knights, leaders and the armour they wore. (S3, ep 2).

Hitler's Supercity: A chilling recreation of the unsettling version of Germany that Adolf Hitler had wanted to create, complete with monstrous monuments and built on slave labour.

The Nasa Connection: Experts open up NASA and secret government files. Can they find proof of alien contact in the recent or ancient past? (S4, ep 5).

Secrets Of The Pyramids: Experts explore the similarities between huge pyramids across the world. Could extraterrestrials have influenced their construction and design? (S4, ep 6).

Fleeing Parchman: A prisoner with a love of crime novels becomes the star of his own story when he escapes from Mississippi's notorious Parchman Penitentiary. (S2, ep 1).

Stonehenge: As Alex Langlands examines the unique properties of the stones of Stonehenge, Helen Skelton visits the nearby village where its builders lived. (S1, ep 5).

The Vessels That Saved D-Day: A chronological telling of the dramatic D-Day story, focusing on the vessels that made the landings possible. (S1, ep 3).

The Nasa Connection: Experts open up NASA and secret government files. Can they find proof of alien contact in the recent or ancient past? (S4, ep 5).

Secrets Of The Pyramids: Experts explore the similarities between huge pyramids across the world. Could extraterrestrials have influenced their construction and design? (S4, ep 6).

Escaping Devil's Island: Petty thief Rene Belbenoit is sentenced to time at France's notorious penal colony in French Guiana - but he is determined to escape or die trying. (S2, ep 5).

Vikings: Helen Skelton and Alex Langlands venture to Lindisfarne and the Isle of Man to unearth the secrets of Viking burial grounds. (S1, ep 6).

Enterprise Vs Japan: The USS Enterprise is the only battle-ready American carrier in the Pacific. For her crew, the war has never been more personal when the Japanese attack. (S1, ep 5).

Swords of Castillon: What can preserved swords from the Battle of Castillon in 1453 tell us about the Hundred Years' War? (S3, ep 3).

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

New. La Conchita Mudslides: After weeks of constant rain, a massive mudslide in an oceanfront California community leaves 10 dead. (S1, ep 8).

Monsters of Diamond Desert: Satellites capture unusual images including markings in the desert, while a strange symbol could be a portal into a lost South American civilisation. (S6, ep 2).

A team of experts investigate some of the most well-known UFO cases of the last 75 years, hoping to uncover the truth. (S1, ep 8).

Ferdinand Porsche: The designer of one of the most popular car brands in history, Ferdinand Porsche would not have seen his success without the support of Adolf Hitler. (S1, ep 5).

The British Connection: Ross Kemp starts his journey under Blackfriars Bridge - the location of Britain's first mafia hit - before following the money trail across the UK. (S1, ep 1).

A gas station camera captures a customer bursting into flames, an ancient statue spins in its locked cabinet, and a camera films an alien-like creature in the sewers. (S1, ep 1).

The Nasa Connection: Experts open up NASA and secret government files. Can they find proof of alien contact in the recent or ancient past? (S4, ep 5).

Secrets Of The Pyramids: Experts explore the similarities between huge pyramids across the world. Could extraterrestrials have influenced their construction and design? (S4, ep 6).

Ferdinand Porsche: The designer of one of the most popular car brands in history, Ferdinand Porsche would not have seen his success without the support of Adolf Hitler. (S1, ep 5).

Enterprise Vs Japan: The USS Enterprise is the only battle-ready American carrier in the Pacific. For her crew, the war has never been more personal when the Japanese attack. (S1, ep 5).

Swords of Castillon: What can preserved swords from the Battle of Castillon in 1453 tell us about the Hundred Years' War? (S3, ep 3).

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

Aliens And Bigfoot: Ancient astronaut theorists hunt for evidence linking Bigfoot to alien species from the distant past. Could the ape-like giant be an extraterrestrial? (S4, ep 7).

Einstein Factor: Ancient astronaut experts believe the minds of Einstein and Galileo were superhuman. Could these historical geniuses have had extraterrestrial connections? (S4, ep 8).

Escaping Devil's Island: Petty thief Rene Belbenoit is sentenced to time at France's notorious penal colony in French Guiana - but he is determined to escape or die trying. (S2, ep 5).

Vikings: Helen Skelton and Alex Langlands venture to Lindisfarne and the Isle of Man to unearth the secrets of Viking burial grounds. (S1, ep 6).

The First Metal Warships: Looking at early metal warships, and how HMS Rattler's screw propeller in 1845 would lead to the revolutionary HMS Dreadnought in the 20th Century. (S1, ep 4).

Aliens And Bigfoot: Ancient astronaut theorists hunt for evidence linking Bigfoot to alien species from the distant past. Could the ape-like giant be an extraterrestrial? (S4, ep 7).

Einstein Factor: Ancient astronaut experts believe the minds of Einstein and Galileo were superhuman. Could these historical geniuses have had extraterrestrial connections? (S4, ep 8).

Alton City Escape: Quawntay Adams gets caught up in a marijuana bust and is sentenced to prison - but when he learns he is going to be a father, he determines to escape. (S2, ep 6).

Elizabeth: In 1592, Elizabeth I visited Sudeley Castle where a spectacular garden was created. 500 hundred years later, a team of archaeologists hunt for this lost gem. (S2, ep 1).

The Grey Ghost: The USS Enterprise became the first ship to receive the Presidential Unit Citation in WWII, following its mission during the bloody Gilbert invasion. (S1, ep 6).

Galloglass - Warlords of Ireland: These Norse-Gaelic clans settled in medieval Ireland and battled Norman invaders. Artefacts and bones from the era shed light on the Galloglass. (S3, ep 4).

Knights Templar: 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.

Dawn of the Celts: A journey to some of the mysteries of how the early Celts emerged and expanded, from collapsed salt mines, to bizarre rituals and lost cities. (1 of 3).

North Korea Death Star: Satellites capture startling images of a structure in North Korea that may be sinister evidence of a looming nuclear threat. (S6, ep 3).

Fleeing Parchman: A prisoner with a love of crime novels becomes the star of his own story when he escapes from Mississippi's notorious Parchman Penitentiary. (S2, ep 1).

William Shatner. Sacred Bones: William Shatner is back on the hunt to find answers to the unexplainable, this week focussing on remains that hold a sacred property. (S3, ep 6).

Antarctic Island Mysteries: A mysterious volcanic island off the coast of Antarctica is explored, while the mummified remains of a teenage girl are found in the Peruvian Andes. (S3, ep 6).

Could Hitler's crazed quest for world domination have been influenced by aliens? Experts reveal the extraterrestrial secret Hitler may have been hiding and where it is now. (S1, ep 10).

Aliens And Bigfoot: Ancient astronaut theorists hunt for evidence linking Bigfoot to alien species from the distant past. Could the ape-like giant be an extraterrestrial? (S4, ep 7).

Einstein Factor: Ancient astronaut experts believe the minds of Einstein and Galileo were superhuman. Could these historical geniuses have had extraterrestrial connections? (S4, ep 8).

The British Connection: Ross Kemp starts his journey under Blackfriars Bridge - the location of Britain's first mafia hit - before following the money trail across the UK. (S1, ep 1).

The Grey Ghost: The USS Enterprise became the first ship to receive the Presidential Unit Citation in WWII, following its mission during the bloody Gilbert invasion. (S1, ep 6).

Galloglass - Warlords of Ireland: These Norse-Gaelic clans settled in medieval Ireland and battled Norman invaders. Artefacts and bones from the era shed light on the Galloglass. (S3, ep 4).

Knights Templar: 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.

Aliens And Cover-ups: In 1980, a man received a code after touching an alleged spaceship. After the sequence was translated, he was told never to speak of the incident again. (S4, ep 9).

Alien Power Plants: Ancient alien theorists ask whether the Greeks and Egyptians understood electricity. Could extraterrestrials have introduced them to such technology? (S4, ep 10).

Alton City Escape: Quawntay Adams gets caught up in a marijuana bust and is sentenced to prison - but when he learns he is going to be a father, he determines to escape. (S2, ep 6).

Elizabeth: In 1592, Elizabeth I visited Sudeley Castle where a spectacular garden was created. 500 hundred years later, a team of archaeologists hunt for this lost gem. (S2, ep 1).

Torpedo Boats At War: From tests in the River Thames, to the German's deadly U-boat attacks in World War II, this episode explores the silent threat of submarines. (S1, ep 5).

Aliens And Cover-ups: In 1980, a man received a code after touching an alleged spaceship. After the sequence was translated, he was told never to speak of the incident again. (S4, ep 9).

Alien Power Plants: Ancient alien theorists ask whether the Greeks and Egyptians understood electricity. Could extraterrestrials have introduced them to such technology? (S4, ep 10).

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

Romans: Silchester is one of the best preserved Roman sites in Britain. Why did Rome's infamous emperor Nero stamp his mark on the town? (S2, ep 2).

Hammer Of Hell: Follow the events of 1944, as the USS Enterprise and the Carrier Task Force push through the Pacific, hammering the enemy bases at Kwajalein and Truk Lagoon. (S1, ep 7).

Skulls of Dornach: The team examines skulls from the site of the 1499 Battle of Dornach, which saw Switzerland win its independence from the Holy Roman Empire. (S3, ep 5).

The US had to beat the Nazis in the race to create an atomic bomb, so they built many secret nuclear facilities. Here, the controversial sites are re-created.

The Art and War: After thriving for three centuries, the Celts turned from traders into proven warriors, weapon masters and metal artists in a time that became their golden age. (2 of 3).

Aliens of the Infinity War: Are unusual patterns in an English field really an alien message? And why is there a secret military facility in the Nevada desert? (S6, ep 4).

The Lost Colony of Roanoke: In 1587, settlers land on Roanoke Island to establish the first English colony in America, but vanish without a trace and leave only cryptic clues. (S4, ep 4).

The Brotherhood Is a Lie: 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. (S1, ep 4).

Toxic Revenge: Deadly toxins are unleashed upon the world without humans to contain them, turning lakes and rivers into streams of acid. (S2, ep 2).

Body and Spirit, Giving Voice to the Dead, Grandfather's Goodbye: A constable investigates an old nurse's ward, an investigator is tormented by a spirit and a girl hears voices. (S1, ep 12).

Aliens And Cover-ups: In 1980, a man received a code after touching an alleged spaceship. After the sequence was translated, he was told never to speak of the incident again. (S4, ep 9).

Alien Power Plants: Ancient alien theorists ask whether the Greeks and Egyptians understood electricity. Could extraterrestrials have introduced them to such technology? (S4, ep 10).

Could Hitler's crazed quest for world domination have been influenced by aliens? Experts reveal the extraterrestrial secret Hitler may have been hiding and where it is now. (S1, ep 10).

Hammer Of Hell: Follow the events of 1944, as the USS Enterprise and the Carrier Task Force push through the Pacific, hammering the enemy bases at Kwajalein and Truk Lagoon. (S1, ep 7).

Skulls of Dornach: The team examines skulls from the site of the 1499 Battle of Dornach, which saw Switzerland win its independence from the Holy Roman Empire. (S3, ep 5).

The US had to beat the Nazis in the race to create an atomic bomb, so they built many secret nuclear facilities. Here, the controversial sites are re-created.

The Da Vinci Conspiracy: Experts scrutinise the paintings, journals and technical drawings of Leonardo Da Vinci. Could they hide evidence of extra-terrestrial beings? (S4, ep 11).

Time Travellers: Scientists explore the possibility that sightings of alien beings or UFOs may be evidence of time travellers from the future. (S4, ep 12).

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

Romans: Silchester is one of the best preserved Roman sites in Britain. Why did Rome's infamous emperor Nero stamp his mark on the town? (S2, ep 2).

Cold War Warriors: Exploring the Cold War vessels that played pivotal roles in events such as the blockade of Cuba and the Vietnam war. (S1, ep 6).

The Da Vinci Conspiracy: Experts scrutinise the paintings, journals and technical drawings of Leonardo Da Vinci. Could they hide evidence of extra-terrestrial beings? (S4, ep 11).

Time Travellers: Scientists explore the possibility that sightings of alien beings or UFOs may be evidence of time travellers from the future. (S4, ep 12).

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

Invincible: For more than 260 years, HMS Invincible lay at the bottom of the Solent. Now, archaeologists are diving beneath the waves to learn more about this game-changing ship. (S2, ep 3).

D-Day In The Pacific: While the Allies storm France, American forces hit the Marianas Islands and the Enterprise supports one of the most deadly battles of the Pacific War. (S1, ep 8).

Carl Wark - Saxon Frontier Fortress: The team investigates the origins of a hill fort situated on Hathersage Moor in the Peak District. (S3, ep 6).

Atlantis: Legend has it that this ancient civilisation was wiped out by a volcanic eruption, but could the discovery of spectacular palaces in Crete and Santorini challenge the theory.

Skyfall: Exploring why the Celts moved from prosperous cities into smaller fortified settlements and how this triggered their decline in Central Europe. (3 of 3).

The Cave to Hell: Discover images of an Iceland cave that could hold alien secrets, military structures in the Utah desert and a bloody stain in the sands of Saudi Arabia. (S6, ep 5).

Time Travellers: Scientists explore the possibility that sightings of alien beings or UFOs may be evidence of time travellers from the future. (S4, ep 12).

Inside the Tower of London: A look at an extraordinary display of nearly 900,000 ceramic poppies in the moat. Also, Curator Bridget explores a reminder of the horrors of war. (S1, ep 3).

Dawn of the Animated Blockbuster: Facing soaring costs, mounting criticism and a tight deadline, Walt Disney creates the first full-length animated feature film. (S1, ep 2).

The Tudors: Amanda explores the feisty affair between Henry VIII and Anne Boleyn, showing how her sexual control ended in disaster. Meanwhile, Dan learns to joust. (S1, ep 2).

The Da Vinci Conspiracy: Experts scrutinise the paintings, journals and technical drawings of Leonardo Da Vinci. Could they hide evidence of extra-terrestrial beings? (S4, ep 11).

Time Travellers: Scientists explore the possibility that sightings of alien beings or UFOs may be evidence of time travellers from the future. (S4, ep 12).

Dawn of the Animated Blockbuster: Facing soaring costs, mounting criticism and a tight deadline, Walt Disney creates the first full-length animated feature film. (S1, ep 2).

D-Day In The Pacific: While the Allies storm France, American forces hit the Marianas Islands and the Enterprise supports one of the most deadly battles of the Pacific War. (S1, ep 8).

Carl Wark - Saxon Frontier Fortress: The team investigates the origins of a hill fort situated on Hathersage Moor in the Peak District. (S3, ep 6).

Atlantis: Legend has it that this ancient civilisation was wiped out by a volcanic eruption, but could the discovery of spectacular palaces in Crete and Santorini challenge the theory.

The Ultimate Guide To UFOs: UFO witnesses have reported a variety of objects in Earth's skies for centuries - could they offer clues about more intelligent life in our galaxy? (S12, ep 32).

Aliens And The Presidents: The White House has consistently denied any knowledge of aliens, but is it in fact possible that extraterrestrials have been influencing presidents? (S12, ep 33).

The Divine Number: What is it about the number 12? It holds divine significance in numerous sacred traditions and it's found repeatedly in ancient architecture. But why? (S12, ep 35).

Plantagenet Canterbury: Alice studies the history of Canterbury, learning the true horror of the Black Death and exploring the iconic cathedral. (5 of 6).

Glasgow Age of Steam: Alice Roberts explores Glasgow's age of steam, from lethal diseases and industrial injury to genteel tea rooms. (S3, ep 5).

East: Alice Roberts and Matt Williams present more outstanding archaeology. In the east of Britain, sites include Must Farm, Colchester, Oakington, Lyminge and Silchester. (S3, ep 1).

West: Alice Roberts and Matt Williams visit the Dorset Country Museum, where they explore finds from archaeological digs across the west of Britain. (S3, ep 2).

Vindolanda And WWII Spitfire: The team search for remains of the crashed WWII Spitfire and discover parts of the cockpit. (1 of 4).

Medieval Mystery: Did our ancestors believe they were cursed? Professor Alice Roberts explores historic cataclysmic events such as wars and floods to dispel the myths. (5 of 5).

Regency Cheltenham: Alice studies the history of Cheltenham, Britain's most Regency town. She attends a period society ball, investigates the rigid social hierarchy and more. (5 of 6).

Plantagenet Canterbury: Alice studies the history of Canterbury, learning the true horror of the Black Death and exploring the iconic cathedral. (5 of 6).

Glasgow Age of Steam: Alice Roberts explores Glasgow's age of steam, from lethal diseases and industrial injury to genteel tea rooms. (S3, ep 5).

East: Alice Roberts and Matt Williams present more outstanding archaeology. In the east of Britain, sites include Must Farm, Colchester, Oakington, Lyminge and Silchester. (S3, ep 1).

West: Alice Roberts and Matt Williams visit the Dorset Country Museum, where they explore finds from archaeological digs across the west of Britain. (S3, ep 2).

Vindolanda And WWII Spitfire: The team search for remains of the crashed WWII Spitfire and discover parts of the cockpit. (1 of 4).

Henry IV: The Usurper: Best known for usurping and murdering his cousin, Henry IV suffered from a mysterious debilitating skin condition during the later years of his reign. (S2, ep 3).

The Missing Jackson Letter: Taylor unearths new testimony from a witness to Slumach's execution and a deathbed letter sends Adam and Kru on a dangerous glacial trek. (S1, ep 1).

Festive Fugitives: Six inmates smash a rusted toilet through a bathroom wall in six minutes in order to escape on a Christmas night in Tennessee. (S1, ep 5).

The Ultimate Guide To UFOs: UFO witnesses have reported a variety of objects in Earth's skies for centuries - could they offer clues about more intelligent life in our galaxy? (S12, ep 32).

Aliens And The Presidents: The White House has consistently denied any knowledge of aliens, but is it in fact possible that extraterrestrials have been influencing presidents? (S12, ep 33).

The Divine Number: What is it about the number 12? It holds divine significance in numerous sacred traditions and it's found repeatedly in ancient architecture. But why? (S12, ep 35).

Henry IV: The Usurper: Best known for usurping and murdering his cousin, Henry IV suffered from a mysterious debilitating skin condition during the later years of his reign. (S2, ep 3).

Inside the Tower of London: A look at an extraordinary display of nearly 900,000 ceramic poppies in the moat. Also, Curator Bridget explores a reminder of the horrors of war. (S1, ep 3).

The Cave to Hell: Discover images of an Iceland cave that could hold alien secrets, military structures in the Utah desert and a bloody stain in the sands of Saudi Arabia. (S6, ep 5).

The Lost Kingdom: According to the earliest Tibetan traditions, hidden in the Himalaya Mountains is Shambhala, a kingdom of the gods. Does this mystical realm truly exist? (S12, ep 36).

The Forbidden Bible: An exploration of the possibility that The Book of Enoch was stricken from the Bible because it documents humanity's extraterrestrial origins. (S12, ep 37).

The Galactic Keyhole: 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).

Stewart Sturling: Alice explores the story of Stewart Britain by visiting the home of the Scottish royals who eventually took the English throne in 1603 and created Great Britain. (6 of 6).

Georgian Edinburgh: Alice Roberts explores Georgian Edinburgh's finest architecture, the roots of modern Scottishness, and some dark imperial controversies. (S3, ep 6).

North: Alice Roberts and Matt Williams visit the Neolithic Orkney World Heritage Site, where they explore finds from archaeological digs across the north of Britain. (S3, ep 3).

Stone Age Engineering and Battle of Bullecourt: Finds from the East include a monument as old as Stonehenge and some disturbing Roman burials. (3 of 4).

Roman Bathhouse and Hessian Camp: Alice Roberts shares archaeological discoveries from the west of the UK, including a Roman bath house and a German camp. (2 of 4).

Ancient Global Warming: Did our ancestors believe they were cursed? Professor Alice Roberts explores historic cataclysmic events such as wars and floods to dispel the myths. (1 of 5).

Victorian Belfast: Alice reveals the history of Belfast, the UK's most Victorian city. She visits the shipyards that built the Titanic and gets locked up in the Crumlin Road gaol. (6 of 6).

Stewart Sturling: Alice explores the story of Stewart Britain by visiting the home of the Scottish royals who eventually took the English throne in 1603 and created Great Britain. (6 of 6).

Georgian Edinburgh: Alice Roberts explores Georgian Edinburgh's finest architecture, the roots of modern Scottishness, and some dark imperial controversies. (S3, ep 6).

North: Alice Roberts and Matt Williams visit the Neolithic Orkney World Heritage Site, where they explore finds from archaeological digs across the north of Britain. (S3, ep 3).

Stone Age Engineering and Battle of Bullecourt: Finds from the East include a monument as old as Stonehenge and some disturbing Roman burials. (3 of 4).

Roman Bathhouse and Hessian Camp: Alice Roberts shares archaeological discoveries from the west of the UK, including a Roman bath house and a German camp. (2 of 4).

Anne: The Forgotten Queen: Professor Alice Roberts delves into the life and death of Anne, Queen of England from 1702-1714, who shockingly endured 17 failed pregnancies. (S2, ep 4).

Royalty: In the early 20th century, the British royal family fought for popularity. Rare film, seen in colour for the first time, tells the story of how they managed to survive. (S1, ep 1).

A hitchhiker is terrified when lights appear to attack him. A sighting in France becomes one of the most investigated cases in UFO history. (S2, ep 12).

In Nova Scotia, a former naval officer sees five bright lights in the skies and a cigar-shaped object behind them.

According to the earliest Tibetan traditions, hidden in the Himalaya Mountains is Shambhala, a kingdom of the gods. Does this mystical realm truly exist.

An exploration of the possibility that The Book of Enoch was stricken from the Bible because it documents humanity's extraterrestrial origins.

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.

In the early 20th century, the British royal family fought for popularity. Rare film, seen in colour for the first time, tells the story of how they managed to survive.

The Forgotten Queen: Professor Alice Roberts delves into the life and death of Anne, Queen of England from 1702-1714, who shockingly endured 17 failed pregnancies.

Wales: Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing UFO encounters of recent times.

Theorists investigate a depiction of a stegosaurus found at Angkor Wat in Cambodia. Could it suggest that alien species killed off the dinosaurs.

No one knows who designed and built Bolivia's sophisticated temple complex. Could it have been aliens? Experts investigate.

An Iranian-American psychopath goes to jail in Southern California, but escapes before he can be transferred to a higher security prison.

For more than 260 years, HMS Invincible lay at the bottom of the Solent. Now, archaeologists are diving beneath the waves to learn more about this game-changing ship.

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

Theorists investigate a depiction of a stegosaurus found at Angkor Wat in Cambodia. Could it suggest that alien species killed off the dinosaurs.

No one knows who designed and built Bolivia's sophisticated temple complex. Could it have been aliens? Experts investigate.

The SS Normandie entered service in 1935 and remains the most powerful steam turbo-electric-propelled passenger ship ever built.

Archaeologists conduct a dig at Auckland Castle in Co Durham, which 700 years ago was home to a group of power-crazed bishops.

Follow the events as the USS Enterprise engages in one of the largest sea battles of the war.

On its 200th anniversary, a team of experts uncover hidden mysteries of the Battle of Waterloo - one of the greatest and bloodiest battles ever fought.

St Paul laid the foundations for what became Christianity. He shaped our world. Now, using the latest research and CGI, see the world that created him.

February 1942, and the sky over Los Angeles erupts as anti-aircraft guns begin firing on strange targets. Could this have been an extraterrestrial raid.

Discover a trail of moving objects in the ice of Antarctica, evidence of one of Joseph Stalin's most insane schemes and a code in the Sonoran Desert.

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.

Ireland: Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing UFO encounters of recent times.

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

Divers probe the depths of the North Pacific, where the world's largest known species of octopus lives.

Theorists investigate a depiction of a stegosaurus found at Angkor Wat in Cambodia. Could it suggest that alien species killed off the dinosaurs.

No one knows who designed and built Bolivia's sophisticated temple complex. Could it have been aliens? Experts investigate.

An Iranian-American psychopath goes to jail in Southern California, but escapes before he can be transferred to a higher security prison.

Follow the events as the USS Enterprise engages in one of the largest sea battles of the war.

On its 200th anniversary, a team of experts uncover hidden mysteries of the Battle of Waterloo - one of the greatest and bloodiest battles ever fought.

St Paul laid the foundations for what became Christianity. He shaped our world. Now, using the latest research and CGI, see the world that created him.

Experts question ancient civilisations' fixation with the Orion constellation. Could this star group have been an entry point for aliens visiting Earth.

Experts question the startling similarities in burial tombs from distant cultures, asking if aliens could have influenced their complicated designs.

The SS Normandie entered service in 1935 and remains the most powerful steam turbo-electric-propelled passenger ship ever built.

Archaeologists conduct a dig at Auckland Castle in Co Durham, which 700 years ago was home to a group of power-crazed bishops.

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.

Experts question ancient civilisations' fixation with the Orion constellation. Could this star group have been an entry point for aliens visiting Earth.

Experts question the startling similarities in burial tombs from distant cultures, asking if aliens could have influenced their complicated designs.

Renowned for its sheer power, the awe-inspiring Queen Elizabeth is the Royal Navy's lead ship and largest ever constructed.

The team search for artefacts from the country's first superhighway - the Bridgewater Canal.

As the US Navy closes in on Okinawa and the Japanese homeland, the Empire unleashes a hellish weapon. Will the Enterprise survive the Kamikaze.

The Pyramids of Giza are the only surviving wonder of the ancient world, becoming a UNESCO World Heritage Site in 1979. But what truths are they hiding.

Uncover some of the world's most renowned encryptions, revealing how they were decoded, the minds who cracked them and the secrets they masked.

During the Cold War, strange lights and unidentified objects put governments around the world on red alert. Could extra-terrestrials have been responsible.

A strange structure discovered in the Gobi Desert could reveal the whereabouts of lost treasure - changing everything we know about Genghis Khan.

Visit ancient architectural wonders and investigate how the Persians, Egyptians, Greeks and Romans accomplished their design and constructions without modern tools.

Fritz Todt was the man tasked with engineering projects including the autobahn, the West Wall defences and more. But in 1942, he died under mysterious circumstances.

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

Surveillance footage from China records a man surviving a lightning strike, not once but twice. In a remote valley in Norway, cameras track mysterious lights.

Experts question ancient civilisations' fixation with the Orion constellation. Could this star group have been an entry point for aliens visiting Earth.

Experts question the startling similarities in burial tombs from distant cultures, asking if aliens could have influenced their complicated designs.

Visit ancient architectural wonders and investigate how the Persians, Egyptians, Greeks and Romans accomplished their design and constructions without modern tools.

As the US Navy closes in on Okinawa and the Japanese homeland, the Empire unleashes a hellish weapon. Will the Enterprise survive the Kamikaze.

The Pyramids of Giza are the only surviving wonder of the ancient world, becoming a UNESCO World Heritage Site in 1979. But what truths are they hiding.

Uncover some of the world's most renowned encryptions, revealing how they were decoded, the minds who cracked them and the secrets they masked.

Did prophets such as Elijah and Joseph Smith communicate with a heavenly source or did they actually come into contact with extraterrestrials.

Ancient alien theorists explore the mysterious phenomena of the Nazca Lines. Could these huge geoglyphs in Southern Peru have an extraterrestrial connection.

Renowned for its sheer power, the awe-inspiring Queen Elizabeth is the Royal Navy's lead ship and largest ever constructed.

The team search for artefacts from the country's first superhighway - the Bridgewater Canal.

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.

Did prophets such as Elijah and Joseph Smith communicate with a heavenly source or did they actually come into contact with extraterrestrials.

Ancient alien theorists explore the mysterious phenomena of the Nazca Lines. Could these huge geoglyphs in Southern Peru have an extraterrestrial connection.

Lacking in speed and might, the SS Andrea Doria more than made up for it in beauty, but on the night of 25 July 1956 - the Italian liner met a disastrous fate.

Uncovering the stories behind a Yorkshire garrison's stables and the horse the Germans could not kill.

The team explore mystery cults and ancient catacombs to determine whether it's possible that the Ark of the Covenant was stolen and hidden in Rome.

For centuries, the Holy Grail has been an object of mystery and fascination, with ties to the Last Supper and the crucifixion of Jesus Christ.

The Zodiac Killer Code reveals the desperate bid to crack the crazed codes sent by America's most mysterious serial killer.

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

When a strange plane is discovered near the sight of the Roswell UFO incident, experts wonder if the aircraft has Nazi or extraterrestrial origins.

A German-American pilot, Dieter Dengler, uses survival skills honed as a child to escape a secret prison in Laos during the early years of the Vietnam war.

William Shatner is back on the hunt to find answers to the unexplainable, this week focussing on the red planet, Mars.

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