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From the destructive Viking axe to the sacred but deadly Samurai katana, razor-sharp blades wielded by fearsome warriors have spilled blood and forged empires.

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.

Ancient Alien theorists explore world mythology as they investigate whether extraterrestrials could be responsible for our existence.

Every inexplicable flash or strange aircraft makes us believe we've spotted extraterrestrials - but what if they've been watching us all along.

Ross Kemp is shocked by what he discovers as he dives on the wreck of a steam-age ship in north Devon, and a potential early slaver ship in Plymouth.

Dr Alice Roberts explores a secret location in the Cotswolds, which gives up a very precious and fragile artefact. (1 of.

Malta loses a natural treasure, an enormous fiery vortex is seen in California and a mysterious radioactive hotspot is found near Chernobyl.

A beat-up '68 Bronco requires a substantial makeover in North Carolina, while in Minnesota, a trashed Trans AM proves hard work when it gets back to the shop.

In Minnesota, a cigarette-infested Dodge Charger receives a smoking-hot makeover, while a foul-smelling Acura comes clean in Georgia.

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

Experts investigate whether alien life forms are thriving in our seas, following Russian cosmonauts' discovery of living plankton in space.

By June 1941, Hitler controlled most of Europe, but the USSR resisted invasion. Then Pearl Harbor changed everything.

As one of their most controversial scientists, Heisenberg was key in the Nazis' efforts to build an atomic bomb. How close was he to achieving his goal.

Explore classic and underrated aircraft, from WWII fighters to the Screaming Eagles F4, showcasing aviation's evolving history.

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

Experts investigate whether alien life forms are thriving in our seas, following Russian cosmonauts' discovery of living plankton in space.

Could some of our ancient texts and structures be home to secret messages left by alien ancestors? If so, what can we learn from them.

Experts on the extraterrestrial investigate the possibility of the religious relic being an alien artefact.

Aliens And The Creation Of Man: Can unexplained advances in human evolution be attributed to alien architects? Alien theorists look at the evidence.

Giorgio Tsoukalos draws on evidence from past series as he takes an in-depth look at the mystery of Southern Peru's Nasca Lines.

Giorgio Tsoukalos takes a closer look at the evidence as he asks whether Earth's stone monoliths were built with extra terrestrial help.

Aliens on the Sun, Megalodon in Japan and The Extraterrestrial Cave: Did a retired Army officer find anomalies in NASA solar photos? Could a giant shark hint at megalodons.

As one of their most controversial scientists, Heisenberg was key in the Nazis' efforts to build an atomic bomb. How close was he to achieving his goal.

Explore classic and underrated aircraft, from WWII fighters to the Screaming Eagles F4, showcasing aviation's evolving history.

When the SS Mont-Blanc and the SS Imo collided in 1917 in the harbour of Halifax, Canada, the subsequent explosion killed or injured almost 11,000 people.

The series ends with a look at the demise of the Roman Empire. Despite efforts from the last emperor, the Romans become outnumbered by foreign invaders.

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