Duplicated Series

Duplicated Series

Hitler's Invisible City (1x6)


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

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  • : 14
  • : 6
  • Science Channel
  • 22