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A secret weapons program in the heart of Austria could have caused trouble for the Allies and may have indicated nuclear plans being concocted by Hitler.

Secret Nazi Ruins

Mystery of the Nazi Nukes

As the Soviet Army pushes the Nazis out of Poland, they discover a massive city of over 1,000 buildings that was unknown to the Allies; using the latest science, experts reveal how Hitler was able to keep this sinister place hidden for so long.

Hitler's Invisible City

One of the largest Nazi bunkers ever constructed, outside the French town of Watten, is a missile facility with storage for 108 missiles and two launch pads.

The Doomsday Castle

New discoveries reveal whether this abandoned mansion was a secret Nazi base intended for a sinister mission.

Conspiracy on Death Island

When a top-secret Nazi base is discovered in France decades after the war ends, experts use cutting-edge tech to reveal the secrets of this compound; what they find could change what is known about D-Day and the last stand of the Nazi regime.

The Devil's Lair

New discoveries on a strange fortified island reveal the terrifying truth behind Hitler's secret plan to win World War II at all costs.

Hitler's Forbidden Island

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Uncovering and examining hidden structures built by the Nazis, from tunnels to towers, artillery sites, resistance nests and communication centers.

S1 E5 | Hitler's Invisible City

E6 | Mystery of the Nazi Nukes

E5 | Hitler's Invisible City

E4 | The Doomsday Castle

E3 | Conspiracy on Death Island

E2 | The Devil's Lair

E1 | Hitler's Forbidden Island