Sky History2

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

The Sleeping Prophet: In the 1900s, a modern-day prophet Edgar Cayce became a worldwide sensation. He claimed to receive visions of both the past and future.

In 2017, astronomers observed the very first visitor from interstellar space, 'Oumuamua'. Craig and Sarah speak with SETI scientists regarding its origin.

In Portsmouth, Alice Roberts learns about Nelson's dark side, the heat of the battle at Trafalgar, the role of the Navy in the British Empire, and more.

Nations vie for sky supremacy, from a near-nuclear disaster in North Carolina to UFO cover-ups and Israel's fighter jet theft.

Ian takes a youthful approach to an old but precious project.

How did the great imperial Chinese dynasties impact modern day China? Explore the origins of the Silk Road and what these dynasties left behind.

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.

The Messerschmitt 262 was the brainchild of genius designer Willy Messerschmitt and it became the first combat jet in history.

The Leopard 2 is probably the best all-around Main Battle Tank today, combining great mobility, a superior gun and excellent protection.

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

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.

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

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

Australia's Worst Crash: Australia's worst aviation accident happened in 1943 when 40 crew died in a B-17 bomber crash.

Death in the Moonlight: In 1944, two Wellington bombers collided in mid-air over Northants. Garth Barnard investigates why 13 young trainees perished.

Alice is in Lincoln, getting to grips with life in medieval England. She visits the magnificent cathedral that was once the tallest building in the world.

Alice heads to London to attempt to make sense of the world-changing events during the short but eventful Restoration period.

When a mysterious circular stone structure is discovered in Scotland, experts investigate whether it's the fabled Round Table of King Arthur.

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.

Through newly colourised footage, enter the heart of the War of the Mediterranean as the fate of North Africa was contested during the battle of El Alamein.

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