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

From ghostly voices to vanishing UFOs, experts investigate puzzling and mysterious signal interferences and break down the meanings behind them. (S1, ep 4).

With the East Coast adventure slowly coming to an end, Peter and Elroy contemplate what they have found and learned throughout the journey. (S2, ep 6).

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).

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

Ancient Astronaut theorists suggest that aliens have been guiding mankind in secret to bring about huge leaps in technological advancement. (S9, ep 6).

The British Empire was once the largest the world has ever seen, but by 1970 it had all but vanished. Relive the final decades of the Empire in colour for the first time. (S1, ep 2).

Al is joined by Chris Daley to uncover the real story of the pirates of the Caribbean and the barbaric realities of the slave trade. (S1, ep 2).

Four US Air Force reservists are pursued by odd lights. Constable Alan Godfrey loses consciousness when he investigates a strange disruption in West Yorkshire. (S2, ep 11).

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 Utah, the Dillmans must tread carefully to avoid triggering an Aztec water trap. The Villescas family discover more secrets beneath the Fire Pits. (8 of 8).

A string of strange events have unfolded at sea in the Bermuda Triangle. Under investigation here is the disappearance of the USS Cyclops in 1918. (1 of 3).

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).

Dr Alice Roberts explores the biggest collection of Roman writing tablets. A fort scattered with human skulls provides evidence of Caesar's invasion. (S6, ep 2).

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

From flat earth legends to Galileo's telescope, explore the major changes in humans' scientific understanding of planet Earth throughout history. (S1, ep 2).

Discover how the Earth itself and its natural forces feed the triangle's notoriety, as we look at the power of a hurricane and how the earth beneath is predicting these storms. (3 of 3).

Was Genghis Khan really buried in an unmarked grave? And was anyone who knew its location killed to keep it a secret? (S1, ep 9).

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

Ancient Astronaut theorists suggest that aliens have been guiding mankind in secret to bring about huge leaps in technological advancement. (S9, ep 6).

Dr Alice Roberts explores the biggest collection of Roman writing tablets. A fort scattered with human skulls provides evidence of Caesar's invasion. (S6, ep 2).

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).

Al Murray is joined by legendary master of stand-up, Anuvab Pal, to explore the truth about Britain's rocky relationship with India. (S1, ep 1).

Al and local comedian Loyiso Gola embark on a road trip through the true British imperial history in South Africa. (S1, ep 3).

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).

Theorists offer compelling evidence suggesting that the ancient monolith thought to depict Egyptian pharaoh Khafra once represented an alien being. (S7, ep 1).

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

As Baghdad fell to US forces in 2003,15,000 priceless antiquities were stolen. Learn about the efforts to catch the culprits. (S1, 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).

In the 21st century, UFOs have gone from fringe science to mainstream obsession. Are we getting closer to understanding the strange events in the sky? (S15, ep 19).

As science turns towards augmenting humanity with technology, theorists suggest that we are merely following the path of our alien creators. (S9, ep 7).

Witness the story of Britain's greatest leader, Winston Churchill, told in colour for the very first time, as he rose quickly through the military and political ranks. (S1, ep 3).

Al and local comedian Loyiso Gola embark on a road trip through the true British imperial history in South Africa. (S1, ep 3).

In Nova Scotia, a former naval officer sees five bright lights in the skies and a cigar-shaped object behind them. (S12, ep 13).

Strange light patterns are seen in Texas. In France, a man's knee injury is suddenly healed after an odd encounter. (S2, ep 14).

Attila and his violent tribe of nomad warriors known as the Huns.

When strange things happen in the air, the Bermuda Triangle becomes a force to be reckoned with. (2 of 3).

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).

What could justify the tomb of Qin Shi Huang, the first Emperor of China, being so grand? And can signs of cannibalism shed light on Neanderthals? (S1, ep 5).

Homicide detective Rod Demery and scientist Professor Turi King visit the ancient city of Verona, Italy, to examine the death of a 14th-century warlord. (S1, ep 5).

The Queen, Her Lover and His Wife: The death of Robert Dudley's wife in 1560 caused a scandal - as the nobleman was Elizabeth I's alleged lover. (S1, ep 4).

How did a Frenchman living in the 16th century predict so many modern-day disasters? This special explores how one person could see into the future.

In the 21st century, UFOs have gone from fringe science to mainstream obsession. Are we getting closer to understanding the strange events in the sky? (S15, ep 19).

As science turns towards augmenting humanity with technology, theorists suggest that we are merely following the path of our alien creators. (S9, ep 7).

What could justify the tomb of Qin Shi Huang, the first Emperor of China, being so grand? And can signs of cannibalism shed light on Neanderthals? (S1, ep 5).

The British Empire was once the largest the world has ever seen, but by 1970 it had all but vanished. Relive the final decades of the Empire in colour for the first time. (S1, ep 2).

Al is joined by Chris Daley to uncover the real story of the pirates of the Caribbean and the barbaric realities of the slave trade. (S1, ep 2).

Al and comic Kevin Kropinyeri reveal that Captain Cook was not really a Captain and explore the Aboriginal history of Australian cricket. (S1, ep 4).

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).

Ancient alien theorists delve into the incredible stories of people who claim they mingled with celestial beings while they were on the brink of death. (S7, ep 2).

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

Rewind and learn about how Western collectors turned a blind eye to ISIS selling Syria's precious ancient past. (S1, ep 2).

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

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).

Ancient Astronaut theorists look at the Aborigine legend of Dreamtime, and ask if these stories hold the proof that aliens created life on Earth. (S9, ep 8).

In this episode, Harry Hill explores why the British think they have a better sense of humour than anyone else in the world. (S1, ep 1).

Al and comic Kevin Kropinyeri reveal that Captain Cook was not really a Captain and explore the Aboriginal history of Australian cricket. (S1, ep 4).

Delve into the incredible collection of UFO stories of first-hand witnesses, from flying saucers to strange encounters in sugar cane fields. (S1, ep 1).

Attila and his violent tribe of nomad warriors known as the Huns.

Discover how the Earth itself and its natural forces feed the triangle's notoriety, as we look at the power of a hurricane and how the earth beneath is predicting these storms. (3 of 3).

Competition fizzles and pops between a major cola brand and their biggest competitor, especially when they decide to launch a blind taste-test marketing plan. (S2, ep 6).

Dr Alice Roberts joins a team of archaeologists as they attempt to restage a Roman cavalry tournament. (S6, ep 3).

Journey hundreds of feet below the streets of major cities from New York to Tokyo as season four explores the layered remnants of civilisations.

A father and son see mysterious lights near their property and call the sheriff's office. A large craft covers a French town in an odd material. (S2, ep 9).

Local authorities receive over 50 UFO reports in the Chicago area on Halloween night. Multiple sightings of a large flying craft in PA are known as the Buck's County Wave. (S2, ep 10).

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).

The prime suspect of a gruesome triple homicide, wax sculptor Robert Irwin sold his story to finance his defence and escape the death penalty. (S1, ep 1).

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).

Ancient Astronaut theorists look at the Aborigine legend of Dreamtime, and ask if these stories hold the proof that aliens created life on Earth. (S9, ep 8).

Dr Alice Roberts joins a team of archaeologists as they attempt to restage a Roman cavalry tournament. (S6, ep 3).

Witness the story of Britain's greatest leader, Winston Churchill, told in colour for the very first time, as he rose quickly through the military and political ranks. (S1, ep 3).

Al and local comedian Loyiso Gola embark on a road trip through the true British imperial history in South Africa. (S1, ep 3).

In this episode, Harry Hill explores why the British think they have a better sense of humour than anyone else in the world. (S1, ep 1).

Experts investigate why so many UFOs have been spotted near remote islands. Could these far-removed spots be the earthly homes of aliens? (S6, ep 1).

Theorists investigate whether sought-after religious relic the Ark of the Covenant could hold connections to our extraterrestrial past. (S6, ep 2).

Throughout time, people have believed mountains were the home of the divine. But could these hilltop spirits have been extraterrestrials? (S6, ep 3).

Revisiting the bloody British uprising against the Romans, presenter Karl Ude-Martinez tests out swords, spears and armour. (S1, ep 5).

Speed has become a decisive feature in war's evolution: from the chariot that brought greater mobility to small handguns like Samuel Colt's revolver. (S1, ep 5).

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).

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

Theorists offer compelling evidence suggesting that the ancient monolith thought to depict Egyptian pharaoh Khafra once represented an alien being. (S7, ep 1).

An elite force of Norwegian resistance fighters return to their invaded homeland to carry out a daring mission. (S1, ep 1).

In the East of Britain, Dr Alice Roberts finds new revelations from 'Britain's Pompeii' and the theatre where Shakespeare premiered Romeo and Juliet. (S5, ep 3).

Dr Alice Roberts explores the biggest collection of Roman writing tablets. A fort scattered with human skulls provides evidence of Caesar's invasion. (S6, ep 2).

from hidden worlds to unexplainable natural phenomena. (S4, ep 19).

from hidden worlds to unexplainable natural phenomena. (S4, ep 20).

This episode explores a catastrophic high-speed train crash in Spain, an out of control cruise liner in Venice, the Deepwater Horizon tragedy and more. (2 of 6).

In the waning days of the war in Europe, the Soviets march into Germany. The Nazis take their final stand as they defend the capital of the Third Reich - Berlin. (S1, ep 6).

Matty Blake heads back to Florida's famed Treasure Coast where he dives on the wrecks of the famed 1715 Spanish treasure fleet. (S2, ep 4).

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).

How did a Frenchman living in the 16th century predict so many modern-day disasters? This special explores how one person could see into the future.

Experts investigate whether the stories of a time when gods and otherworldly beings inhabited the planet are more than mere mythology. (S8, ep 2).

Experts investigate whether rocket scientist Wernher von Braun might have found inspiration in technology found at the alleged UFO crash in Roswell. (S8, ep 3).

An investigation into the escape artist and how he accomplished his feats. Could he really have dislocated his own shoulders to escape from a strait jacket? (S1, ep 3).

Bil explores why the battle of the Alamo is remembered, how Davy Crockett really died, and if Civil War soldiers were healed by an angel's glow. (S1, ep 4).

Experts investigate whether the US military has a secret space programme, as well as evidence suggesting alien races have been in conflict for millennia. (S8, ep 9).

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

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

Did a biblical patriarch receive instructions from 200 angels, and was Egypt's most controversial Pharaoh an extraterrestrial being? (S16, ep 1).

Three of the most extravagant and expensive weddings in history are profiled. Lavish and luxurious was the only way to celebrate for these big spenders. (S1, ep 9).

Meet the ancients who bankrolled the construction of massive churches and temples in a desperate attempt to buy their way into heaven. (S1, ep 10).

From booby traps on battlefields and burning mud used in Roman revolts to modern day letter bombs, the Ancient Discoveries team investigate revolutionary weapons.

Explore the history of the Presidency, beginning with racial tensions. Some have taken steps towards perfect union, others haven't. (1 of 6).

Explore the history of the presidents who made an impact through imagining what we could be, not just what we are. (2 of 6).

Examine the story of Queen Tiye, who - over 3,000 years ago - surpassed her rivals and inspired a religious revolution that changed Egypt and the world. (S1, ep 1).

Ross Kemp continues his adventure in Scapa Flow, plunging down on the wrecks of a German warship and an experimental submarine aircraft called the M2. (S1, ep 2).

Dr Alice Roberts explores the most exciting finds from West Britain. Iron Age gold in Britain is unearthed and a Viking camp is discovered. (S6, ep 1).

Dr Alice Roberts joins a team of archaeologists as they attempt to restage a Roman cavalry tournament. (S6, ep 3).

Today, we tend to think that our scientific knowledge can help protect us from almost anything, including natural disasters. But is that really true? (S3, ep 28).

All over the world, there are giant monoliths that our ancient ancestors carved out of solid rock. But what was the purpose of these huge stone monuments? (S3, ep 29).

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).

This July, 75 years have passed since the Roswell incident. This two-part documentary revisits the alleged crash of an extra terrestrial craft at Roswell, New Mexico in 1947. (1 of 2).

What's going on in Area 51? What crashed at Roswell? And what's happening at the top-secret Dugway Proving Ground? Experts go in search of answers. (S1, ep 2).

Wernher von Braun was vital to NASA's Apollo 11 mission to put a man on the Moon, but this 'American hero' had his Nazi past kept under wraps. (S1, ep 2).

Hitler held many secrets he went through great lengths to hide throughout his life. This episode reveals the truth about his drug addiction and genital deformity. (2 of 4).

Amanda Holden and Dan Jones explore how attitudes towards sex differed drastically thousands of years ago in Ancient Sparta and Ancient Egypt. (S1, ep 1).

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

Ancient Astronaut theorists suggest that aliens have been guiding mankind in secret to bring about huge leaps in technological advancement. (S9, ep 6).

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).

In the 21st century, UFOs have gone from fringe science to mainstream obsession. Are we getting closer to understanding the strange events in the sky? (S15, ep 19).

Tattoos, piercings and body modifications are big business. But could our desire for these changes stem from a profound link to our ancestors? (S12, ep 19).

Could Earth's deepest caves hide secret conduits to other worlds? Or harbour evidence that aliens once visited our planet? Experts investigate. (S7, ep 3).

On 8 April 2011, the FBI declassified decades of top secret government documents for the first time. Here, experts examine the possibility of the end of the world. (S1, ep 1).

Could elite groups of power players be plotting the fate of the world? Discover the plans and goals of the world's most secretive organisations. (S1, ep 19).

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).

By May 1940, Europe had been at war for nine months. Yet Britain and France declared war on Germany in September 1939 following Hitler's attack on Poland. (S1, ep 1).

Did a biblical patriarch receive instructions from 200 angels, and was Egypt's most controversial Pharaoh an extraterrestrial being? (S16, ep 1).

Could claims of.

Suggs discovers the history of the British pub and gets stuck into a load of issues. (S1, ep 2).

Explore the men in charge whose rampant egos and misguided belief in their own abilities led to their country making fatal mistakes in the war. (S1, ep 1).

Investigating the disappearance of pilot Frederick Valentich, whose last transmission gives an account of what he experienced. (S1, ep 2).

Born into privilege, Roosevelt strives to make his mark. After reaching New York's halls of power, he finds his greatest adventure yet at the age of 42. (1 of 2).

It's crunch time for Herman Lay who takes a small-time crisps business to a national scale. But a competitor with a new kind of chip is lurking in the shadows. (S2, ep 6).

Dr Alice Roberts reveals the forgotten story of the Roman Army's cavalry as she journeys across Hadrian's Wall. (S6, ep 4).

Examine the story of Queen Tiye, who - over 3,000 years ago - surpassed her rivals and inspired a religious revolution that changed Egypt and the world. (S1, ep 1).

Before the Unabomber, New Yorkers were terrified for 16 years by an attacker who planted bombs across the city. The culprit? An electrician named George Metesky. (S1, ep 5).

Dive deep into the ancient cultures of Egypt, Rome and Nepal and reveal how their people treated their dead. (S1, ep 1).

Adam and Rob serve up their most annoying stings in the history of the Pain Index, chasing them with a tiny fish that has venom to die for. Season finale. (S2, ep 10).

Did a biblical patriarch receive instructions from 200 angels, and was Egypt's most controversial Pharaoh an extraterrestrial being? (S16, ep 1).

Could claims of.

Dr Alice Roberts reveals the forgotten story of the Roman Army's cavalry as she journeys across Hadrian's Wall. (S6, ep 4).

In this episode, Harry Hill explores why the British think they have a better sense of humour than anyone else in the world. (S1, ep 1).

Al and comic Kevin Kropinyeri reveal that Captain Cook was not really a Captain and explore the Aboriginal history of Australian cricket. (S1, ep 4).

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).

Nestled in Utah lies a ranch some believe to be a hotbed of strange phenomena. Is it all connected to an alien entity known as the Skinwalker? (S12, ep 21).

Are we being watched by otherworldly beings? Experts make surprising discoveries as they explore the ancient past for evidence of alien overseers. (S7, ep 4).

From the Cold War to the TV set, experts question whether the government is actively controlling what you think, how you act and what you believe. (S1, ep 3).

Experts question if there really is an elite group of powerbrokers trying to rule the planet. And if so, who is behind this New World Order? (S1, ep 4).

A discovery at Memphis International Airport shakes the foundations of one of the US' wealthiest families. (S1, ep 4).

Taking place between August and September 1940, The Battle of Britain remains one of the most famous battles of World War Two. (S1, ep 2).

Ancient astronaut theorist Giorgio Tsoukalos takes a look back at some of the most mysterious yet incredible creatures ever investigated. (S16, ep 2).

Ancient Astronaut theorists suggest that China, with its history of technological advancement and isolationism, could have been the home of alien beings. (S9, ep 10).

Chris Packham is a self-confessed dog obsessive, but he wants to know when animals first became our best friends. (S1, ep 3).

Explore how the seeds of Japan's defeat in 1945 were sown a decade earlier with the occupation of Manchuria in China. (S1, ep 2).

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).

Roosevelt takes over during one of America's most turbulent periods in history. His desire to fight for the working man reshapes the political landscape. (2 of 2).

A sweet business partnership turns sour, leading Adolphus Green to create one of the most iconic cookie and cracker companies in history. (S2, ep 7).

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

Cleopatra II's reign was a truly dramatic and grisly tale. She saw her dynasty torn apart by hatred - but also saved it from destruction. (S1, ep 2).

How will the new Cold War, involving the US, Russia, the UK and China, play out? Will trade and cyber warfare be the worst of it or is military war inevitable? (S2, ep 10).

The siege of Vadum Jacob in 1179 saw Muslim forces overcome the Knights Templar. Now, forensic analysis of the battleground can shed light on the war. (S3, ep 1).

This tourist hotspot is also rumoured to be the epicentre of dark and sinister forces from Native American lore that lure visitors to their deaths. (S2, ep 11).

A demonic truck driver, disembodied voices, nightmarish skinwalkers and a time loop are all reported to exist in Canyonlands National Park. (S2, ep 12).

Ancient astronaut theorist Giorgio Tsoukalos takes a look back at some of the most mysterious yet incredible creatures ever investigated. (S16, ep 2).

Ancient Astronaut theorists suggest that China, with its history of technological advancement and isolationism, could have been the home of alien beings. (S9, ep 10).

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

Suggs discovers the history of the British pub and gets stuck into a load of issues. (S1, ep 2).

Explore the men in charge whose rampant egos and misguided belief in their own abilities led to their country making fatal mistakes in the war. (S1, ep 1).

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).

When millions responded to a call to storm Area 51, the US military vowed deadly force. Are they hiding the truth about extraterrestrials on Earth? (S12, ep 20).

History's greatest geniuses have often said their ideas came from visions or hallucinations. But could they have come from aliens? Experts investigate. (S7, ep 5).

From flying saucers to killer drones, discover the out-of-this-world technology the US military is using to conquer the globe. (S1, ep 22).

Are governments around the world using weather control to incite the next World War and possibly destroy the planet? A team of experts investigate. (S1, ep 6).

The curator of the J Paul Getty Museum's collection falls into disgrace, brought down by a jet-setting dealer. (S1, ep 5).

Hitler turns his tanks towards Russia. After a succession of devastating victories, the Germans delay and the fierce Russian winter takes a grip. (S1, ep 3).

Discover 10 locations around the world that just might be hiding alien bases, from a cavern beneath the ice in Antarctica to a Chinese lake. (S16, ep 3).

It was mankind's finest hour, the greatest technological achievement of the 20th century - the Apollo 11 mission to the Moon. (S9, ep 11).

Lorraine Kelly explains our constant harking back to Winston Churchill and the part played by Britain in the Allied victory. (S1, ep 4).

Explore how the Axis Powers' ruthless, brutal occupation and exploitation of other countries contributed to their demise. (S1, ep 3).

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

The true story of America's 16th president, starting with his rise up from a poverty-ridden childhood through his determination to leave his mark on the world. (1 of 3).

Competition stirs when a chemist at the Joseph A Campbell company invents a condensed soup that wows the US, and Henry Heinz creates a rival offering. (S2, ep 8).

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

The story of Cleopatra Selene, the little-known daughter of Cleopatra and Antony, who witnessed her dynasty collapse but survived to become a great queen. (S1, ep 3).

Discover the key role scientific pioneers played in reshaping our solar system. Plus, learn how technology helped humans explore its furthest reaches. (S1, ep 3).

The Royals and the Ripper: With evidence from historians, police officers and experts, discover whether Prince Albert Victor was really Jack the Ripper. (S1, ep 5).

Were these fascinating skulls carved thousands of years ago by an ancient civilisation? Or are they proof that extraterrestrials visited the Aztecs? (S1, ep 10).

Discover 10 locations around the world that just might be hiding alien bases, from a cavern beneath the ice in Antarctica to a Chinese lake. (S16, ep 3).

It was mankind's finest hour, the greatest technological achievement of the 20th century - the Apollo 11 mission to the Moon. (S9, ep 11).

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

Chris Packham is a self-confessed dog obsessive, but he wants to know when animals first became our best friends. (S1, ep 3).

Explore how the seeds of Japan's defeat in 1945 were sown a decade earlier with the occupation of Manchuria in China. (S1, ep 2).

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).

Over the past 20 years, thousands of potentially habitable exoplanets have been found. Could they be home to intelligent extraterrestrial life? (S12, ep 22).

Experts investigate the mysterious origins of mummification. Could this global practice be proof that aliens once visited Earth? (S7, ep 6).

Animal cloning has been a reality for decades but the disturbing truth is that human cloning may be much closer than you think. (S1, ep 7).

Is this half-man, half-ape simply a figment of our collective imagination or does he really exist? Experts ask whether he is being hidden from us and why. (S1, ep 8).

In December 2021, a hedge-fund billionaire and collector is forced to turn over $70 million worth of stolen loot. (S1, ep 6).

The Battle of Stalingrad is considered by many historians to be the turning point in World War Two in Europe, where the German army was bled dry in Russia. (S1, ep 4).

History's greatest geniuses have often said their ideas came from visions or hallucinations. But could they have come from aliens? Experts investigate. (S7, ep 5).

Russia spans over six million square miles of some of the most rugged terrain on Earth, much of which is uninhabited and largely unexplored. (S9, ep 12).

Comedian Reginald D Hunter and Alexei Sayle peel away the thin veneer that disguises Britain's enduring class system. (S1, ep 5).

Victory in war doesn't just require sound military strategy, vital resources and equipment are also critical. Discover how the Axis powers failed in this regard. (S1, ep 4).

Rob and Shelley Hartland believe they live under a.

With the Civil War fully underway, Abraham Lincoln is forced to learn how to manage a military as Commander in Chief - quickly. (2 of 3).

It's crunch time for Herman Lay who takes a small-time crisps business to a national scale. But a competitor with a new kind of chip is lurking in the shadows. (S2, ep 6).

Could new evidence found at the sacrificial alter, El Castillo, shed light on the Maya? And what can science tell us about ancient chemists? (S1, ep 6).

Homicide detective Rod Demery and forensic scientist Turi King investigate an Iron Age victim, so well-preserved that he seems to be peacefully sleeping. (S1, ep 6).

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).

Archaeologists investigate the full story of how the most famous Roman leader, Julius Caesar, rose to power and the battle that took him to the brink of defeat. (1 of 2).

Archaeologists investigate the full story of how the most famous Roman leader, Julius Caesar, rose to power and the battle that took him to the brink of defeat. (2 of 2).

From a meeting in Texas that left onlookers with mysterious injuries to strange cattle mutilations, discover history's terrifying encounters. (S16, ep 4).

Russia spans over six million square miles of some of the most rugged terrain on Earth, much of which is uninhabited and largely unexplored. (S9, ep 12).

Could new evidence found at the sacrificial alter, El Castillo, shed light on the Maya? And what can science tell us about ancient chemists? (S1, ep 6).

Lorraine Kelly explains our constant harking back to Winston Churchill and the part played by Britain in the Allied victory. (S1, ep 4).

Explore how the Axis Powers' ruthless, brutal occupation and exploitation of other countries contributed to their demise. (S1, ep 3).

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).

Giorgio A Tsoukalos and David Childress explore the mysterious chain of man-made islets in Micronesia's Nan Madol. Could local legends be true? (S12, ep 23).

Could extraterrestrials have left us clues to the universe's mysteries? Experts investigate cryptic puzzles that might have been left by ancient aliens. (S7, ep 7).

Every culture and religion on the planet believes that an evil one will usher in the end of days. But who is this Anti-Christ? And how can we hope to stop him? (S1, ep 9).

We rely on machines for virtually every aspect of modern life. But is technology going too far, too fast? And will humans suffer the consequences? (S1, ep 10).

Douglas Latchford was the go-to expert in Khmer antiquities. But an investigation sees his world crumble. (S1, ep 7).

The Western Allies of World War II launched the largest amphibious invasion in history when they assaulted Normandy, on 6 June 1944. (S1, ep 5).

From glyphs in the Peruvian desert to spiral petroglyphs embedded with advanced maths, explore some of the world's most intriguing symbols and codes. (S16, ep 5).

The US military has denied that the 1947 Roswell crash was anything other than a weather balloon, but FBI files include a memo that indicate otherwise. (S9, ep 13).

Liza Tarbuck tackles the national obsession with all things weather-related. Season finale. (S1, ep 6).

In our final episode, we examine how each Axis Power had troubles on their own home front, leading to disaster in the final days of the war. (S1, ep 5).

Visit Australia's vast expanses, where farmers have been finding mutilated cattle. Plus, meet Phil Tindale who believes he witnessed two UFOs in combat. (S1, ep 6).

As the Civil War rages on and the casualties build, Abraham Lincoln looks to the future and seeks a general who can end it once and for all. (3 of 3).

A sweet business partnership turns sour, leading Adolphus Green to create one of the most iconic cookie and cracker companies in history. (S2, ep 7).

Finds from the East include a monument as old as Stonehenge and some disturbing Roman burials. (3 of 4).

In 218 BC, a Carthaginian army set out to challenge the might of Rome. The route chosen by Hannibal has been disputed ever since and researchers believe they could now have the answer.

Four US Air Force reservists are pursued by odd lights. Constable Alan Godfrey loses consciousness when he investigates a strange disruption in West Yorkshire. (S2, ep 11).

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).

Homicide detective Rod Demery and forensic scientist Turi King examine a murder victim dated to the time of the Picts, unearthed in a remote sea cave in Scotland. (S1, ep 1).