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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.

Examine some of the most notable catastrophes in history, from the Hindenburg disaster to the Wall Street Crash and China's Cultural Revolution.

Thousands of UFO sightings and abductions are reported every year. This series examines these accounts and casts new light on historic cases.

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.

The need for expression goes to the core of humanity. Take a trip from communication's origins to the creation of the first alphabet and the earliest newspaper.

Theorists investigate a depiction of a stegosaurus found at Angkor Wat in Cambodia. Could it suggest that alien species killed off the dinosaurs.

No one knows who designed and built Bolivia's sophisticated temple complex. Could it have been aliens? Experts investigate.

The F-16 and MiG-29, born rivals of the skies, embody opposing design ideals: US tech-driven agility versus Soviet rugged aerodynamics.

We examine how the battleship began the 20th century as a dominant force, but then saw its weaknesses exploited mercilessly in the World Wars.

A look from the Russian perspective at the Red Army's assault on Japanese-occupied Manchuria, which fell on the same day a second nuclear attack hit Japan. (10 of.

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

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

Alice explores the story of Stewart Britain by visiting the home of the Scottish royals who eventually took the English throne in 1603 and created Great Britain. (6 of.

Theorists investigate a depiction of a stegosaurus found at Angkor Wat in Cambodia. Could it suggest that alien species killed off the dinosaurs.

No one knows who designed and built Bolivia's sophisticated temple complex. Could it have been aliens? Experts investigate.

Death on the Great Plains: Garth Barnard fact-finds to determine the cause of a terrible accident in Nebraska in 1944, when a plane crashed during a violent storm.

Conspiracy or Confusion? The Duke of Kent Crash: Controversial royal Prince George perished in a plane crash in 1942. Was a pilot error or sabotage to blame.

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

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.

Experts investigate tunnels rumoured to be the hiding place of lost royal treasure, they find evidence of human sacrifice for Viking god Odin.

Follow the conflict between the families' old guard and a new generation of younger, American-born mobsters willing to defy their authority.

Theorists investigate a depiction of a stegosaurus found at Angkor Wat in Cambodia. Could it suggest that alien species killed off the dinosaurs.