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What will humans find when reaching other planets? And just how dangerous might it be.

Theorists search ancient texts for proof that extraterrestrials influenced the miraculous advances made by the Sumerian civilisation 5,000 years ago.

Experts investigate mysterious relics that have been revered by cultures for millennia. Could these sacred items truly hold divine or otherworldly power.

A look at Raoul Moat's shooting spree in Northumberland during the summer of 2010, the huge manhunt that followed and the aftermath of his attacks.

In Nazi Germany, questions about witchcraft attracted SS leaders. Himmler, dedicated to an Aryan super race, established a team to research witchcraft.

From tests in the River Thames, to the German's deadly U-boat attacks in World War II, this episode explores the silent threat of submarines.

What was it like to face a Napoleonic cavalry charge? Find out as the cannon, grenade and Brown Bess musket go under the microscope.

Discover strange markings in the remote region of Northern Finland and reveal secrets found deep in the Antarctic.

Experts investigate the power of the number three in history, science and astronomy. Could its huge significance bear links to extraterrestrial life.

Experts explore the controversy surrounding the ancient Crystal Skulls, asking what powers might be unleashed if all 13 artefacts were brought together.

Denise Fergus reflects on the murder of her son. Two-year-old James Bulger was tortured and killed by 10-year-olds Jon Venables and Robert Thompson in 1993.

A hard-hitting look at the murder of Rachel Nickell, who was sexually assaulted and murdered in front of her two-year-old son on Wimbledon Common in 1992.

It's July 10, 1943 and the Allied Forces have evicted the Axis Powers from North Africa and can finally begin the Italian Campaign.

December 1941: Under cover of a fierce naval bombardment, a taskforce of elite British commandos sail towards the Norwegian town of South Vaagso.

Alice Roberts and Matt Williams present more outstanding archaeology. The team unearths a mass grave and search the Thames for clues to a 17th century tragedy.

Alice Roberts and Matt Williams visit the Neolithic Orkney World Heritage Site, where they explore finds from archaeological digs across the north of Britain.

Experts investigate the power of the number three in history, science and astronomy. Could its huge significance bear links to extraterrestrial life.

Experts explore the controversy surrounding the ancient Crystal Skulls, asking what powers might be unleashed if all 13 artefacts were brought together.

Violence erupts as the Romans and Barbarians try to co-exist in the empire. The Goths rebel under the leadership of Alaric, a man they call king.

With Roman rulers now at the mercy of the barbarians, three Roman generals compete to become emperor - but one's savage strategy comes out on top.

Emperor Domitian tasks master builder Haterius with constructing a labyrinth underneath the Colosseum floor.

The wife of Garry Newlove, who was beaten to death outside his home in Cheshire in 2007, looks back at the night of her husband's murder.

Galen of Pergamon makes a name for himself as a physician for gladiators. Meanwhile, a devastating plague sweeps through the city.

Uncover haunting factors and new evidence, possibly leading to fresh verdicts for these enigmatic men.

The theories, conspiracies and facts relating to Rudolf Hess's dramatic flight to Scotland in 1941 and his subsequent death in Spandau prison.

Experts investigate the power of the number three in history, science and astronomy. Could its huge significance bear links to extraterrestrial life.