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At the end of 1939, the German Army invades Poland. Examine how Hitler succeeded in pushing through his rearmament and war plans relatively unhindered.

Count down the world's top 10 mysterious islands, including sites said to be home to giants and islands that disappear into thin air.

Count down the top ten alien craft, from V-shaped objects to orbs of light to flying saucers.

On the orders of Adolf Hitler, the Nazi invaders of Alderney utilised more than 5,000 slave labourers to build a series of protective fortifications. (1 of.

The World War II killings carried out by the Nazis on Alderney represent the worst mass murder in British history - yet no one has been brought to justice. (2 of.

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

The Lost Standard, the Steam Gun and the Sacrificial Throne: Investigate an intriguing 3,500-year-old box, a steam-powered gun and a monument that may have been an Aztec throne.

Considered one of the New Seven Wonders of the World, the Mayan City of Chichen Itza was the capital of a powerful civilisation.

Count down the top ten alien petroglyphs around the world, from strange figures to flying craft and carvings of what appear to be astronauts.

The Sleeping Prophet: In the 1900s, a modern-day prophet Edgar Cayce became a worldwide sensation. He claimed to receive visions of both the past and future.

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

The designer of one of the most popular car brands in history, Ferdinand Porsche would not have seen his success without the support of Adolf Hitler.

The team hunt for artefacts from World War II. (4 of.

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

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.

Hearing about his great-grandfather who served in the Merchant Navy inspires Ross to explore the wreck of a WWII cargo ship and try to recover its military supplies.

Count down the top ten alien petroglyphs around the world, from strange figures to flying craft and carvings of what appear to be astronauts.

The Sleeping Prophet: In the 1900s, a modern-day prophet Edgar Cayce became a worldwide sensation. He claimed to receive visions of both the past and future.

Archaeologists identify a site containing unknown structures. A lake full of jellyfish is studied and Argentinian researchers make a discovery.

Archaeologists find an ancient structure built on granite columns, puzzling stone spheres are found in Costa Rica and Mexican skeletal remains emerge.

The courageous story of a Jewish child who survived the Holocaust as the Nazi's youngest soldier, hiding his secret for years before finally discovering his true identity.

The Search for King Solomon's Mines: Fascinating new evidence reveals fresh clues about the whereabouts of King Solomon's mines - and the fabulous treasures said to be in them.

The stories of the siege of Tobruk and the battle of El Alamein, the result of which saw the first serious defeat of the German army.

This episode remembers some of the thunderous naval battles which took place during the Pacific War.

Count down the top ten alien petroglyphs around the world, from strange figures to flying craft and carvings of what appear to be astronauts.