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The astonishing accounts of four railway journeys that changed history, including the perilous expedition that made a young Winston Churchill world famous.

Exploring the machines that hide in the shadows, capturing, transmitting and analysing vital combat information.

A neglected warning inside a mighty conqueror's tomb heeds one of the deadliest invasions in human history.

The world's greatest showman, a rumoured valley of gold and a fortress of protection - their legends prove fame, wealth and even safety can come at a dire cost.

Explore some of the most valuable treasures found in the most unlikely of ways.

As we plan to travel to new worlds, how are we preparing to become human extraterrestrials? Will we survive into the unknown.

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.

Ancient alien theorists ask whether the Greeks and Egyptians understood electricity. Could extraterrestrials have introduced them to such technology.

A powerful earthquake in 2018 seemed to lead to an increase in UFO sightings in Alaska - but why? Do the extra terrestrials have something to protect here.

President Hindenburg suspends freedom of speech and Hitler comes to power in 1933. The first concentration camps for political opponents are set up.

Exploring the machines that hide in the shadows, capturing, transmitting and analysing vital combat information.

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.

Discover an array of mysterious phenomena seen from above, including a Nazi weapon in Northern France and a Russian military tower near Chernobyl.

Experts scrutinise the paintings, journals and technical drawings of Leonardo Da Vinci. Could they hide evidence of extra-terrestrial beings.

Scientists explore the possibility that sightings of alien beings or UFOs may be evidence of time travellers from the future.

In 1944, D-Day pierces the Atlantic Wall, as Operation Bagration crushes the Wehrmacht in the East. The fall of the Third Reich begins.

The Code That Won the Great War: Revealing the encrypted German telegram could save Britain in its darkest hour. Can a team of geniuses decode the message in time.

The battle hits a turning point and Donitz unleashes an advanced torpedo to flip the momentum. Roberts and Laidlaw must devise a strategy to combat the new threat.

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.

Silchester is one of the best preserved Roman sites in Britain. Why did Rome's infamous emperor Nero stamp his mark on the town.

Venture to England's South Coast, as we dive with sharks, explore the battlements of Drake's Island, uncover the origins of Scouts, and discover fossils on the Isle of Wight. (4 of.

Experts scrutinise the paintings, journals and technical drawings of Leonardo Da Vinci. Could they hide evidence of extra-terrestrial beings.

Scientists explore the possibility that sightings of alien beings or UFOs may be evidence of time travellers from the future.

A volcanic island called Kolombagara, with a secret cave, rises out of the Pacific Ocean. In Vietnam, bones from an unknown animal are found.

A cave bursting with bones is found in the jungles of Mexico. In Hawaii, archaeologists find unusual sculptures with big heads and bulging eyes.

Follow a battle for survival in a terrible day of vicious WWII combat, when the USS Enterprise lost many of her crew and her sister ship, the USS Hornet.

Beneath a shopping arcade in Leeds' city centre, archaeologists discovered a Roman-era Christian cemetery containing the remains of 317 individuals.

With all the activity that's been recorded here, Sedona seemingly doubles as an intergalactic airport - but what is drawing UFOs to this spot.

Explore the stories of six formidable rulers, revealing their dark legacies and the impact they've had on history.

The murder in 1943 of Sir Harry Oakes in the Bahamas, where the Duke of Windsor was governor at the time and influenced the outcome of his murder trial.

Experts scrutinise the paintings, journals and technical drawings of Leonardo Da Vinci. Could they hide evidence of extra-terrestrial beings.