Man Beasts: We're all fascinated by mysteries. But is the unexplained really unexplainable? William Shatner investigates in an attempt to find a logical explanation. (S3, ep 2).

Rendlesham: Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing UFO encounters of recent times. (S1, ep 4).

Aliens Gods And Heroes: Ancient alien theorists explore the origins of mythical gods. Could these tales of superhuman beings be based on sightings of extraterrestrials? (S3, ep 16).

The Power of Three: Experts investigate the power of the number three in history, science and astronomy. Could its huge significance bear links to extraterrestrial life? (S5, ep 14).

Precious Cargo: The astonishing accounts of four railway journeys that changed history, including the perilous expedition that made a young Winston Churchill world famous. (S1, ep 5).

Hidden In Plain Sight 1935-1938: In 1934, Hitler's government is firmly in the saddle. Most Germans support Hitler's anti-Jewish policy and the regime's terror soon escalates. (S1, ep 5).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 5).

Aliens Gods And Heroes: Ancient alien theorists explore the origins of mythical gods. Could these tales of superhuman beings be based on sightings of extraterrestrials? (S3, ep 16).

The Power of Three: Experts investigate the power of the number three in history, science and astronomy. Could its huge significance bear links to extraterrestrial life? (S5, ep 14).

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).

Stirling: 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).

Hidden In Plain Sight 1935-1938: In 1934, Hitler's government is firmly in the saddle. Most Germans support Hitler's anti-Jewish policy and the regime's terror soon escalates. (S1, ep 5).

Submarines: War Beneath The Waves: From early beginnings in the American War of Independence to modern day, this is the story of the submarine and its role in naval warfare. (S1, ep 2).

Mysterious Sky Moans And Dragon Sighting: Could a UFO seen by multiple residents of a Florida town be the real deal? Also, a ghoulish moaning sound comes from the sky. (S2, ep 20).

Dog Headed Man and Summoning Spaceships: A Tennessee man may have captured footage of the infamous Dogman creature without realising it. (S2, ep 2).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 11).

In 1993, a teenage girl walking her dog in Shropshire, England, witnesses a cylindrical object in the sky. School kids in Florida report multiple UFO sightings in 1967. (S2, ep 2).

A couple spot a huge blimp-shaped craft hovering over Michigan's Lake Erie in 1988. In 1963, two sisters and their housekeeper report being knocked down by a UFO emitting flames. (S2, ep 1).

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

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

The Princes in the Tower: Royal Blood: Richard III, whose body was recently exhumed, is linked to the deaths of two princes in the Tower of London in 1483. (S1, ep 5).

The Freemasons: The Freemasons' fundamental ideals are liberty, equality, fraternity, tolerance and humanity. But others say that this secret society has very different goals. (S1, ep 5).

Aliens Gods And Heroes: Ancient alien theorists explore the origins of mythical gods. Could these tales of superhuman beings be based on sightings of extraterrestrials? (S3, ep 16).

The Power of Three: Experts investigate the power of the number three in history, science and astronomy. Could its huge significance bear links to extraterrestrial life? (S5, ep 14).

Wartime Dover: As series two kicks off, Professor Alice Roberts examines Britain in wartime by looking at the coastal town of Dover.

Leeds: 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. (4 of 6).

Mind Control: Three spine-tingling stories, including a seance that turns a housewife into a literary genius as she channels a spirit to write a series of acclaimed books. (S3, ep 10).

Scotland: Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing UFO encounters of recent times. (S1, ep 5).

Aliens In America: Experts investigate strange carvings from 8,000 BC and unexplained sightings in the New World. Is there more to the US's past than history books suggest? (S6, ep 4).

Aliens And Stargates: Experts investigate remote ruins, mysterious caves and legendary mountain portals. Could these alleged stargates have brought ancient aliens to Earth? (S6, ep 5).

The Star Children: Experts comb history for evidence of children with strange abilities and great knowledge. Could these young people have been born from ancient aliens? (S6, ep 6).

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. (S1, ep 1).

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. (S1, ep 2).

Democracy Without Democrats 1929-1933: A protest turns into a racist and anti-Jewish movement during the 1920s and the NSDAP use emotions to gain the loyalty of the people. (S1, ep 3).

Aliens In America: Experts investigate strange carvings from 8,000 BC and unexplained sightings in the New World. Is there more to the US's past than history books suggest? (S6, ep 4).

Aliens And Stargates: Experts investigate remote ruins, mysterious caves and legendary mountain portals. Could these alleged stargates have brought ancient aliens to Earth? (S6, ep 5).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 6).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 8).

Blood Antiquities - Islamic State and the Theft of Syria's Past: Rewind and learn about how Western collectors turned a blind eye to ISIS selling Syria's precious ancient past. (S1, ep 2).

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

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

War of the Roses - Towton: Exploring the impact of the Battle of Towton during the War of the Roses, Karl and Kevin continue their look at how weapons and body armour developed. (S1, ep 2).

Greece: In 1944, 28 Greek socialists were shot in Syntagma Square and 100,000 had perished by the end of the Civil War. Was this the old order Winston Churchill had longed for? (S2, ep 1).

Nazi She-Devil: Explore how women were active, often violent participants in the war and its atrocities - especially during the holocaust. (S1, ep 2).

Society: From Lao Tzu, Confucius and Mencius to Plato and Aristotle, pick the brains of the great philosophers who have radically changed the way ordinary people have lived.

Aliens In America: Experts investigate strange carvings from 8,000 BC and unexplained sightings in the New World. Is there more to the US's past than history books suggest? (S6, ep 4).

Aliens And Stargates: Experts investigate remote ruins, mysterious caves and legendary mountain portals. Could these alleged stargates have brought ancient aliens to Earth? (S6, ep 5).

The Star Children: Experts comb history for evidence of children with strange abilities and great knowledge. Could these young people have been born from ancient aliens? (S6, ep 6).

Crossing the Rubicon: Bettany Hughes revisits the iconic moment when Julius Caesar led his army across the River Rubicon while analysing his character and health. (S1, ep 3).

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 5).

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 6).

Queensland & Papua New Guinea: Travel to Queensland's farming country where rain-drenched crops meet the Great Barrier Reef. Is there a link between water and UFO activity? (S1, ep 3).

Treasures Of The Gods: Across the world, there are stories of treasures that have been lost for centuries. Could these ancient relics have been hidden by extraterrestrials? (S6, ep 7).

Aliens And The Red Planet: Experts question what probes on Mars may have found over the past 40 years. Could NASA be hiding proof of life on the Red Planet from the public? (S6, ep 8).

The Shamans: Throughout history, spiritual leaders known as shamans have healed, protected and advised. Could they really be in contact with extraterrestrial realms? (S6, ep 9).

The Racial State 1933-1934: President Hindenburg suspends freedom of speech and Hitler comes to power in 1933. The first concentration camps for political opponents are set up. (S1, ep 4).

Hidden In Plain Sight 1935-1938: In 1934, Hitler's government is firmly in the saddle. Most Germans support Hitler's anti-Jewish policy and the regime's terror soon escalates. (S1, ep 5).

In 1923, Adolf Hitler led the infamous Beer Hall Putsch, an attempt to take power in Germany by force. It was a day that would change the world forever, birthing Hitler's regime.

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 10).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 11).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 9).

Treasures Of The Gods: Across the world, there are stories of treasures that have been lost for centuries. Could these ancient relics have been hidden by extraterrestrials? (S6, ep 7).

Aliens And The Red Planet: Experts question what probes on Mars may have found over the past 40 years. Could NASA be hiding proof of life on the Red Planet from the public? (S6, ep 8).

Catastrophe: Examine some of the most notable catastrophes in history, from the Hindenburg disaster to the Wall Street Crash and China's Cultural Revolution. (S1, ep 2).

Part One: Hear about the personal rivalry between Winston Churchill and Adolf Hitler, exploring how their exploits in World War I shaped their future commands. (1 of 2).

The Shamans: Throughout history, spiritual leaders known as shamans have healed, protected and advised. Could they really be in contact with extraterrestrial realms? (S6, ep 9).

Halifax Explosion: When the SS Mont-Blanc and the SS Imo collided in 1917 in the harbour of Halifax, Canada, the subsequent explosion killed or injured almost 11,000 people. (S1, ep 3).

The Princes in the Tower: Royal Blood: Richard III, whose body was recently exhumed, is linked to the deaths of two princes in the Tower of London in 1483. (S1, ep 5).

Cougars and Fantasists: Meet the women who took Hitler under their wing, training him in the methods of high society and power - only to be left behind once he achieved it. (S1, ep 3).

Treasures Of The Gods: Across the world, there are stories of treasures that have been lost for centuries. Could these ancient relics have been hidden by extraterrestrials? (S6, ep 7).

Aliens And The Red Planet: Experts question what probes on Mars may have found over the past 40 years. Could NASA be hiding proof of life on the Red Planet from the public? (S6, ep 8).

The Shamans: Throughout history, spiritual leaders known as shamans have healed, protected and advised. Could they really be in contact with extraterrestrial realms? (S6, ep 9).

Part One: Hear about the personal rivalry between Winston Churchill and Adolf Hitler, exploring how their exploits in World War I shaped their future commands. (1 of 2).

From medical inventions to military espionage, take a look at how one of the most studied and dissected conflicts in history still continues to surprise and shape the world.

Oblivion Calling: From ghostly voices to vanishing UFOs, experts investigate puzzling and mysterious signal interferences and break down the meanings behind them. (S1, ep 5).

Origin Unknown: From ghostly voices to vanishing UFOs, experts investigate puzzling and mysterious signal interferences and break down the meanings behind them. (S1, ep 6).

The Mayan Conspiracy: Experts investigate startling evidence suggesting that the Ancient Maya conspired with aliens. Was this how they acquired their knowledge of astrology? (S4, ep 1).

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

Secrets And Lies: Learn how Lawrence of Arabia used guerilla warfare against the Ottoman Empire's railways. Also, what secrets lie under New York's Grand Central Station? (S1, ep 6).

Up in Flames 1936-1940: At the end of 1939, the German Army invades Poland. Examine how Hitler succeeded in pushing through his rearmament and war plans relatively unhindered. (S1, ep 6).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 6).

The Mayan Conspiracy: Experts investigate startling evidence suggesting that the Ancient Maya conspired with aliens. Was this how they acquired their knowledge of astrology? (S4, ep 1).

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

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).

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

Up in Flames 1936-1940: At the end of 1939, the German Army invades Poland. Examine how Hitler succeeded in pushing through his rearmament and war plans relatively unhindered. (S1, ep 6).

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).

UFO Eruption and Alien Spheres: Exploring the possible truth behind bizarre sightings near volcanoes. Plus, who - or what - made the strange stone spheres of Costa Rica? (S2, ep 21).

UFO Window Seat and Lost Underwater City: The team look into a series of unusual photos and videos, from a UFO sighting to a Japanese city possibly lurking beneath the waves. (S2, ep 22).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 12).

Wales: Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing UFO encounters of recent times. (S1, ep 1).

Battle of Hastings: Exploring the impact of the Battle of Hastings in 1066, Karl and Kevin continue their look at how weapons and body armour developed. (S1, ep 3).

Da Vinci's Armageddon: Was Leonardo Da Vinci, one of history's great thinkers also one of its greatest prophets? And did he envision world destruction? (S1, ep 3).

Two explorers get a shock when they go to get a closer look at humungous human-like footprints discovered in Northern California and making headlines around the globe. (1 of 2).

The Riddle of the Romanovs: After Tsar Nicholas II and his family were killed by Bolsheviks in 1918, the fate of his daughter Anastasia became unknown - did she actually survive? (S1, ep 2).

The Mayan Conspiracy: Experts investigate startling evidence suggesting that the Ancient Maya conspired with aliens. Was this how they acquired their knowledge of astrology? (S4, ep 1).

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

Georgian Bristol: Alice Roberts explores the Georgian era in her hometown of Bristol, from architectural gems and the world's first chocolate factory to the horror of the slave trade.

Lancaster: Dan Jones visits Lancaster Castle to explore its grisly history of crime and punishment, including the infamous Lancashire Witches trials. (5 of 6).

Curses: Do cursed objects really exist? This episode explores a painting in Britain that is said to start deadly house fires, a sinister doll in Florida and a curse-proof house.

Phoenix Lights: Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing UFO encounters of recent times. (S1, ep 6).

The Doomsday Prophecies: Experts scrutinise the Maya Calendar, which predicted the world would end in 2012. Could it have anticipated the arrival of an extraterrestrial god? (S4, ep 2).

Crystal Skulls: Experts explore the controversy surrounding the ancient Crystal Skulls, asking what powers might be unleashed if all 13 artefacts were brought together. (S5, ep 13).

First World War: A look into how the efficiency of the rail networks on both sides helped cause the stalemate of the First World War. (S1, ep 7).

The Gates of Hell 1941-1942: In the shadow of the war, the Nazi regime gradually advances its \"final solution to the Jewish problem\", culminating in the Holocaust. (S1, ep 7).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 8).

The Doomsday Prophecies: Experts scrutinise the Maya Calendar, which predicted the world would end in 2012. Could it have anticipated the arrival of an extraterrestrial god? (S4, ep 2).

Crystal Skulls: Experts explore the controversy surrounding the ancient Crystal Skulls, asking what powers might be unleashed if all 13 artefacts were brought together. (S5, ep 13).

Wartime Dover: As series two kicks off, Professor Alice Roberts examines Britain in wartime by looking at the coastal town of Dover.

Edinburgh: 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. (1 of 5).

The Gates of Hell 1941-1942: In the shadow of the war, the Nazi regime gradually advances its \"final solution to the Jewish problem\", culminating in the Holocaust. (S1, ep 7).

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).

Land UFO and Superhuman Strength: An object is spotted over one of the world's holiest sites. Plus, could a floating \"spaceman\" in a famous photograph be an elaborate hoax? (S2, ep 23).

The London Serpent and Moon UFOs: Tony and the team investigate a possible serpentine monster in the Thames and a sighting of a bizarre flying object crossing the moon. (S2, ep 24).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 13).

Ireland: Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing UFO encounters of recent times. (S1, ep 2).

Unreal Estates: Immerse yourself in the jaw-dropping world of three crazy rich ancients who built some of the largest, most luxurious palaces ever known to man. (S1, ep 7).

Mega Mausoleums: These crazy rich ancients poured their money into building the most luxurious final resting places for themselves after death. (S1, ep 8).

Deadly Poisons: For some covert missions, assassination is the goal, and lethal toxins are deployed by spy agencies to kill perceived foes.

Pray for Mercy: The witch trials are suddenly halted when the Massachusetts elite are accused of witchcraft. As the prisoners are freed, Salem must deal with the aftermath. (4 of 4).

Maree Man and the Mystery Mummies: 96 ancient mummies are unearthed in Chile, while a recently discovered tomb in Egypt leads to an astonishing discovery. (S1, ep 1).

The Doomsday Prophecies: Experts scrutinise the Maya Calendar, which predicted the world would end in 2012. Could it have anticipated the arrival of an extraterrestrial god? (S4, ep 2).

Crystal Skulls: Experts explore the controversy surrounding the ancient Crystal Skulls, asking what powers might be unleashed if all 13 artefacts were brought together. (S5, ep 13).

Edwardian Cardiff: Alice tells the story of Edwardian Britain by studying the history of Cardiff, Britain's most Edwardian town. (3 of 6).

Arundel: 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).

Ghosts in the Machine: Three tales of everyday objects that are haunted by the dead, including the story of a man who is attacked in bed by an invisible force. (S3, ep 6).

Chicago: Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing UFO encounters of recent times. (S1, ep 7).

The Greys: Experts investigate the 'greys' - mysterious beings with big heads and eyes found carved into rocks. Who are these strange figures and what inspired them? (S4, ep 3).

Aliens Gods And Heroes: Ancient alien theorists explore the origins of mythical gods. Could these tales of superhuman beings be based on sightings of extraterrestrials? (S3, ep 16).

Second World War: Homefront: Eyewitness accounts of how trains were able to bring back troops from Dunkirk, and evacuate hundreds of children to safety. (S1, ep 8).

Genocide 1942-1944: Along with Treblinka and Majdanek, Sobibor was one of the camps used in Operation Reinhard, in which the Nazis murdered almost two million people. (S1, ep 8).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 9).

The Greys: Experts investigate the 'greys' - mysterious beings with big heads and eyes found carved into rocks. Who are these strange figures and what inspired them? (S4, ep 3).

Aliens Gods And Heroes: Ancient alien theorists explore the origins of mythical gods. Could these tales of superhuman beings be based on sightings of extraterrestrials? (S3, ep 16).

Georgian Bristol: Alice Roberts explores the Georgian era in her hometown of Bristol, from architectural gems and the world's first chocolate factory to the horror of the slave trade.

Cardiff: Dan Jones explores the history of Cardiff castle over more than 2,000 years and reveals how it transformed into a lavish Victorian home. (2 of 5).

Genocide 1942-1944: Along with Treblinka and Majdanek, Sobibor was one of the camps used in Operation Reinhard, in which the Nazis murdered almost two million people. (S1, ep 8).

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).

Ancient Alien Carvings and Bigfoot 'Shrooms: Meet a forager who claims he has captured bigfoot calls on video. Plus, could rock paintings in India be proof of otherworldly life? (S2, ep 25).

The Nightcrawler and the Beast in the Tree: The team looks into a sasquatch sighting. Meanwhile, a man may have captured footage of the Fresno Nightcrawlers in his backyard. (S2, ep 26).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 15).

Pentagon: Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing UFO encounters of recent times. (S1, ep 3).

Leaders: Venture back in time and explore the stories of some of history's most notable leaders, from Sir Winston Churchill to Fidel Castro and Nelson Mandela. (S1, ep 3).

Churchill: Charlie Higson, Judi Love and Geoff Norcott discuss the man once voted the Greatest Briton. (S1, ep 1).

The race to develop the first atomic bomb was critical amid the struggle for WWII victory. Experts reveal new evidence behind Germany's top-secret development of nuclear weapons. (S1, ep 1).

Cro Magnon: Himmler's desire to unearth the true origins of humanity led to an attempt to prove the Paleolithic past of Germany's Aryan race. (S1, ep 5).

The Greys: Experts investigate the 'greys' - mysterious beings with big heads and eyes found carved into rocks. Who are these strange figures and what inspired them? (S4, ep 3).

Aliens Gods And Heroes: Ancient alien theorists explore the origins of mythical gods. Could these tales of superhuman beings be based on sightings of extraterrestrials? (S3, ep 16).

Civil War Oxford: Alice explores the English Civil War through the history of Oxford, the city at the heart of a battle between an autocratic king and his rebellious parliament. (4 of 6).

Frontline Dorset: Tony Robinson winds back the clock to 1940 for a walk along Dorset's Jurassic Coast, revealing the county's World War II role as the frontline against Hitler. (S1, ep 1).

Medical Mysteries: Medics at a hospital fall gravely ill after treating a mysteriously ailing patient in a circumstance that can't be explained by science. Or can it? (S3, ep 9).

Alan Godfrey/'Abductions': Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing recent UFO encounters. (S1, ep 8).

Aliens And Mega-Disasters: Did Mother Nature cause the volcanoes, earthquakes and floods of ancient times? Or could aliens have been responsible? Experts investigate. (S4, ep 4).

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).

Warships of The World Wars: We examine how the battleship began the 20th century as a dominant force, but then saw its weaknesses exploited mercilessly in the World Wars. (S1, ep 1).

Armageddon 1943-1945: The defeat at Stalingrad in 1943 was the turning point of the war and convinced the Nazi leadership to intensify their terror and propaganda campaigns. (S1, ep 9).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 10).

Aliens And Mega-Disasters: Did Mother Nature cause the volcanoes, earthquakes and floods of ancient times? Or could aliens have been responsible? Experts investigate. (S4, ep 4).

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).

Edwardian Cardiff: Alice tells the story of Edwardian Britain by studying the history of Cardiff, Britain's most Edwardian town. (3 of 6).

York: 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. (3 of 5).

Armageddon 1943-1945: The defeat at Stalingrad in 1943 was the turning point of the war and convinced the Nazi leadership to intensify their terror and propaganda campaigns. (S1, ep 9).

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 Creeping Horror and Viral Car Jumpers: The team determine whether a horrifying creature could be from another planet. Plus, are clips of acrobats flipping over cars legit? (S2, ep 27).

UFO on Fire and Dinosaur on the Beach: The team attempt to get to the bottom of a prehistoric-looking creature in Georgia and a strange, otherworldly sighting in Canada. (S2, ep 28).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 16).

Rendlesham: Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing UFO encounters of recent times. (S1, ep 4).

Villainy and Vice: Science shines a light on the dark side of Ancient Egypt, from a 5,000-year-old homicide to drug-fuelled debauchery - and one very shocking revelation. (S1, ep 3).

Treacherous Traps: Examine a variety of diabolical booby traps used to ensnare treasure hunters, outwit body snatchers or gravely harm wartime enemies. (S1, ep 3).

Tolkien's Monsters: Enter JRR Tolkien's fantastical world of hobbits, orcs and wizards, and uncover the real-life influences that shaped his epic fantasy books. (S1, ep 9).

Rome's First Emperor: In 32BC, Octavian stole the secret will of Mark Antony, his most dangerous political rival, which allowed him to establish himself as Rome's first emperor. (S1, ep 4).

Aliens And Mega-Disasters: Did Mother Nature cause the volcanoes, earthquakes and floods of ancient times? Or could aliens have been responsible? Experts investigate. (S4, ep 4).

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).

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

The Birth of Industry: Tony heads out on a 40-mile walk through the wild, dramatic and romantic Peak District - the place where the Industrial Revolution began. (S1, ep 2).

Falling Man, Space Rocks, Missing Feet: A high-rise window washer somehow survives a 50-storey fall and ball-sized ice chunks fall from the sky. (S1, ep 1).

Stephenville: Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing UFO encounters of recent times. (S1, ep 9).

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).

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).

Submarines: War Beneath The Waves: From early beginnings in the American War of Independence to modern day, this is the story of the submarine and its role in naval warfare. (S1, ep 2).

The Reckoning 1945-1948: In 1945, WWII was over but the violence had not ended. The survivors want to blame the Germans. The reckoning with National Socialism is ambivalent. (S1, ep 10).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 11).

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).

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).

Civil War Oxford: Alice explores the English Civil War through the history of Oxford, the city at the heart of a battle between an autocratic king and his rebellious parliament. (4 of 6).

Leeds: 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. (4 of 6).

The Reckoning 1945-1948: In 1945, WWII was over but the violence had not ended. The survivors want to blame the Germans. The reckoning with National Socialism is ambivalent. (S1, ep 10).

Rescue Ships: 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. (S1, ep 7).

Modern Day Dinosaur Sighting, Mysterious Lights Above Norway and Girl Punches Down Tree: Look into reports of a dinosaur, odd lights in Norway and a girl with immense strength. (S3, ep 1).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 17).

Scotland: Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing UFO encounters of recent times. (S1, ep 5).

Lost Cities: Through records in historical texts, oral tradition and folklore, William Shatner explores how a once-thriving community becomes a lost city. (S3, ep 30).

Curses Unleashed: Many people are afraid of touching cursed objects or visiting cursed places, but are curses actually real? And if so, how are they triggered? (S3, ep 32).

Juan Borgia: A Death in the Dynasty: The infamous Borgia family were devastated when favourite son Juan was killed in 1497. Can modern experts crack the case and find the killer? (S1, ep 6).

The Hermetic Order of the Golden Dawn: Examine the secret society that laid the groundwork for modern Wiccanism. Were their members really engaged with the paranormal? (S1, ep 6).

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).

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).

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).

The Tudor Way: Tony Robinson takes a 45-mile hike through the beautiful countryside of the Weald in Kent and East Sussex, discovering its rich and surprising Tudor heritage. (S1, ep 3).

Texas Lights, The Bloop, Vanishing Boat: Residents of a Texas town report strange lights in the night sky. (S1, ep 2).

Seti: Craig Charles joins forces with world-renowned space journalist Sarah Cruddas to investigate some of the most perplexing UFO encounters of recent times. (S1, ep 10).

Aliens And Insects: Could insects have descended from extraterrestrials? Experts investigate whether Earth's 10 quintillion critters could have dangerous links to aliens. (S6, ep 10).

Alien Breeders: Theorists ask whether a currently unidentified species represented in our DNA could be a result of breeding between humans and aliens in the remote past. (S6, ep 11).

Reptillians: Experts question whether ancient myths provide evidence that reptillian aliens are more than just pop-culture creations and staples of science-fiction. (S6, ep 12).

Up in Flames 1936-1940: At the end of 1939, the German Army invades Poland. Examine how Hitler succeeded in pushing through his rearmament and war plans relatively unhindered. (S1, ep 6).

The Gates of Hell 1941-1942: In the shadow of the war, the Nazi regime gradually advances its \"final solution to the Jewish problem\", culminating in the Holocaust. (S1, ep 7).

Genocide 1942-1944: Along with Treblinka and Majdanek, Sobibor was one of the camps used in Operation Reinhard, in which the Nazis murdered almost two million people. (S1, ep 8).

Aliens And Insects: Could insects have descended from extraterrestrials? Experts investigate whether Earth's 10 quintillion critters could have dangerous links to aliens. (S6, ep 10).

Alien Breeders: Theorists ask whether a currently unidentified species represented in our DNA could be a result of breeding between humans and aliens in the remote past. (S6, ep 11).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 12).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 13).

Behind the Mask - Robbing the Land of the Pharaohs: A fragment of papyrus worth more than its weight in gold appears at auction, spelling the end for a superstar Oxford don. (S1, ep 3).

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

Bound And Buried: Discover what would happen to priceless artefacts such as the Mona Lisa, the Declaration of Independence and the Liberty Bell if humans were no longer around.

Battle of Hastings: Exploring the impact of the Battle of Hastings in 1066, Karl and Kevin continue their look at how weapons and body armour developed. (S1, ep 3).

Syria: Since the Syrian civil war broke out in 2011, 400,000 have been killed in the conflict. Who is to blame for this and the terrible conditions in which its people live? (S2, ep 2).

Cougars and Fantasists: Meet the women who took Hitler under their wing, training him in the methods of high society and power - only to be left behind once he achieved it. (S1, ep 3).

Agriculture: What do the plans to terraform Mars and the ancient Egyptians' irrigation of the River Nile have in common? Find out why no agriculture would mean no culture at all.

Aliens And Insects: Could insects have descended from extraterrestrials? Experts investigate whether Earth's 10 quintillion critters could have dangerous links to aliens. (S6, ep 10).

Alien Breeders: Theorists ask whether a currently unidentified species represented in our DNA could be a result of breeding between humans and aliens in the remote past. (S6, ep 11).

Reptillians: Experts question whether ancient myths provide evidence that reptillian aliens are more than just pop-culture creations and staples of science-fiction. (S6, ep 12).

Rome's First Emperor: In 32BC, Octavian stole the secret will of Mark Antony, his most dangerous political rival, which allowed him to establish himself as Rome's first emperor. (S1, ep 4).

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 7).

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases. (S1, ep 8).

Melbourne & Regional Victoria: Explore Melbourne's long history of UFO sightings and hear incredible first-hand accounts from Victoria's locals of otherworldly encounters. (S1, ep 4).

Aliens & Superheroes: Experts investigate whether ancient tales of beings with super-human powers could be inspired by extra-terrestrials who came to Earth in the past. (S6, ep 13).

Tesla Experiment: 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).

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

Armageddon 1943-1945: The defeat at Stalingrad in 1943 was the turning point of the war and convinced the Nazi leadership to intensify their terror and propaganda campaigns. (S1, ep 9).

The Reckoning 1945-1948: In 1945, WWII was over but the violence had not ended. The survivors want to blame the Germans. The reckoning with National Socialism is ambivalent. (S1, ep 10).

In 2012, Italian divers discovered the wreck of the biggest aircraft in WWII, Messerschmidt Gigant, off the coast of Sardinia. This film explores the search for the wreckage.

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 16).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 17).

Embark on an eye-opening journey as experts investigate the startling mysteries captured by satellites orbiting the Earth: from hidden worlds to unexplainable natural phenomena. (S4, ep 15).

Aliens & Superheroes: Experts investigate whether ancient tales of beings with super-human powers could be inspired by extra-terrestrials who came to Earth in the past. (S6, ep 13).

Tesla Experiment: 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).

Leaders: Venture back in time and explore the stories of some of history's most notable leaders, from Sir Winston Churchill to Fidel Castro and Nelson Mandela. (S1, ep 3).

Part Two: Through archive footage, see how these radically different characters clashed in a fascinating subplot of World War II. (2 of 2).

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

SS Clare Lilley: For decades, residents in Nova Scotia have reported munitions washing up on their shores - believed to have come from the wreck of the SS Clare Lilley. (S1, ep 4).

Juan Borgia: A Death in the Dynasty: The infamous Borgia family were devastated when favourite son Juan was killed in 1497. Can modern experts crack the case and find the killer? (S1, ep 6).

Hitler's Lovers: Discover the many lovers of Adolf Hitler - uncovering the unfortunate demise of all who dared resist his love, affection and sexual appetite. (S1, ep 4).