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Experts investigate whether the US military has a secret space programme, as well as evidence suggesting alien races have been in conflict for millennia.

At the beginning of 1942, war wages on the battlefields in Eastern Europe, North Africa and Asia Pacific.

Fritz Todt was the man tasked with engineering projects including the autobahn, the West Wall defences and more. But in 1942, he died under mysterious circumstances.

In 1923, Adolf Hitler led the infamous Beer Hall Putsch, an attempt to take power in Germany by force. It was a day that would change the world forever, birthing Hitler's regime.

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

Experts investigate whether the US military has a secret space programme, as well as evidence suggesting alien races have been in conflict for millennia.

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

In the shadow of the war, the Nazi regime gradually advances its "final solution to the Jewish problem.

Along with Treblinka and Majdanek, Sobibor was one of the camps used in Operation Reinhard, in which the Nazis murdered almost two million people.

The defeat at Stalingrad in 1943 was the turning point of the war and convinced the Nazi leadership to intensify their terror and propaganda campaigns.

In 1945, WWII was over but the violence had not ended. The survivors want to blame the Germans. The reckoning with National Socialism is ambivalent.

Alien Golden Orb, Yeti Caught On Tape, Las Vegas Close Encounter: Did a Las Vegas family have a close encounter with ten-foot-tall aliens in their backyard.

Fritz Todt was the man tasked with engineering projects including the autobahn, the West Wall defences and more. But in 1942, he died under mysterious circumstances.

In 1923, Adolf Hitler led the infamous Beer Hall Putsch, an attempt to take power in Germany by force. It was a day that would change the world forever, birthing Hitler's regime.

Explore some of the most valuable treasures found in the most unlikely of ways.

Relics from the crucifixion of Jesus Christ have fascinated the faithful for 2,000 years.

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