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Experts uncover a mysteriously abandoned underground complex that may have hid something very dark.
As the Nazis plot the beginning of their empire, Heinrich Himmler transforms the ruins of a German castle into a mysterious Nazi complex.
New discoveries reveal whether this abandoned mansion was a secret Nazi base intended for a sinister mission.
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.
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.
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.