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Experts investigate ancient man's apparent obsession with building pyramids, and whether extra-terrestrials may have helped with their construction.

Ancient alien theorists investigate evidence suggesting that extraterrestrials have played a pivotal role in the progress of mankind.

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

Towards the end of the war, the bombing of the city of Dresden provided one of the most controversial episodes of the war. This episode tells the story.

Series exploring the role of trains in the major conflicts of the past 150 years. Auschwitz survivors explore the railways' part in the Nazis' mass murder.

The estate agent reveals the story of her abduction, rape and incarceration, which occurred in 1992 whilst showing a man around a house.

Hobby Lobby and the Museum of the Bible: A discovery at Memphis International Airport shakes the foundations of one of the US' wealthiest families.

Experts investigate ancient tales and accounts of robots. If these sophisticated machines did exist in bygone days, what might have happened to them.

C: Experts investigate whether the stories of a time when gods and otherworldly beings inhabited the planet are more than mere mythology.

Hugh and the team unearth William the Conqueror's lost priory hidden beneath Lenton in Nottingham.

Hugh and the team attempt to uncover a secret World War military base on the clifftops of South Shields.

Hugh and the team search for a Roman settlement under the back gardens of Florence Road in Maidstone, Kent.

A look back at the 1989 Marchioness disaster. Fifty-one people died when the pleasure boat collided with a dredger ship on the River Thames.

The father of Clare Wood discusses how her murder in Salford in 2009 gave birth to a new law allowing people to find out if their partners have an abusive past.

Rob visits the village of Wymondham, where in 1549, a dispute over landownership and sheep grazing sparked a violent rebellion by peasants.

Experts investigate ancient tales and accounts of robots. If these sophisticated machines did exist in bygone days, what might have happened to them.

C: Experts investigate whether the stories of a time when gods and otherworldly beings inhabited the planet are more than mere mythology.

Hugh and the team attempt to uncover a Roman fort, connected to Hadrian's Wall, that's buried beneath the back gardens of Benwell in Newcastle.

Hugh and the team attempt to uncover a Viking burial ground hidden beneath Masham in North Yorkshire.

Missionaries Marcus and Narcissa settle by the Columbia River to convert the Cayuse. Cultural clashes and a measles outbreak spark a confrontation.

The abduction of nine-year-old Cynthia kicks off a series of increasingly deadly confrontations between her Comanche captors and the newly independent Texas.

A shocking look at the murder of eight-year-old Victoria Climbie, who was tortured and killed by her guardians in North London in 2000.

Survivors, victims' relatives and former detectives reflect on the Real IRA car bomb that killed 29 people in Omagh, Northern Ireland in 1998.

Families of victims and former friends open up about Stephen Griffiths, the Bradford killer who was found guilty of murdering three women in 2010.

Experts investigate ancient tales and accounts of robots. If these sophisticated machines did exist in bygone days, what might have happened to them.