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The Mysteries of the World's Oldest Temple: The rock-hewn pillars of Gobekli Tepe in Turkey have baffled archaeologists for decades - who built this incredible monument, and why.

Experts investigate the mysterious origins of mummification. Could this global practice be proof that aliens once visited Earth.

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

In 1943, Germany fell at Stalingrad, its first major defeat. In the Pacific, Japan lost momentum after the US won at Guadalcanal.

In 1941, Japan, the Axis ally of Germany and Italy, attacked the US naval base at Pearl Harbour, Hawaii, with no warning and no declaration of war.

The Battle of Leyte Gulf tells the story of the largest sea conflict in history involving Pearl Harbor warships and the largest battleships in the world.

On 19 August 1987, Michael Ryan went on a bloody rampage in the village of Hungerford. Ryan shot and killed 16 people, and his crime would change the face of Britain.

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.

Experts find evidence suggesting that ancient aliens saved humanity from great floods sent by the gods. Can we rely on extra-terrestrials to save us again.

Experts explore the disappearance of civilisations throughout time and across the globe. Could clues left in their wake point to an otherwordly explanation.

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

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

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

Witnesses and terrorism experts revisit May 2013, when soldier Lee Rigby was murdered by two religious extremists near his barracks in Woolwich.

Caroline Roberts, one of the surviving victims of serial killers Rose and Fred West, is among those revisiting the couple's horrific 1970s murder spree.

Rob Bell visits the site of the battle in 1645 that resulted in Charles I's surrender and paved the way for rule by parliamentary democracy.

Experts find evidence suggesting that ancient aliens saved humanity from great floods sent by the gods. Can we rely on extra-terrestrials to save us again.

Experts explore the disappearance of civilisations throughout time and across the globe. Could clues left in their wake point to an otherwordly explanation.

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

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.

After settlers encroach on Native lands, Miami Chief Little Turtle leads the Northwest Confederacy to victory over US forces.

John Colter, famed hunter, joins the fur trade. Ignoring Blackfeet warnings about hunting sacred beaver on their land, he's captured and must run for his life.

Investigation into Jeremy Bamber's murder of his family in Essex in 1985. Sentenced for life, he still maintains he is innocent. Is the right person behind bars.

The parents of innocent 11-year-old Rhys Jones, shot on his way home from football club in Liverpool 2007, speak about the harrowing day when they lost their son.

Documentary examining the fatal stabbing of 21-year-old motorist Stephen Cameron during an altercation on the M25 in 1996.

Experts find evidence suggesting that ancient aliens saved humanity from great floods sent by the gods. Can we rely on extra-terrestrials to save us again.