Mysteries of the Abandoned

Nazi Death Star (3x8)

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A Nazi fortress that could have changed history if it was finished, an underwater graveyard of unexpected American treasures, and a network of tunnels hiding a secret history of New York. Stories: 1) La Coupole, Pas De Calais, France; 2) Red Army HQ, Wünsdorf, Germany; 3) SS Empire Heritage, Malin Head, Ireland; 4) Old Croton Aqueduct, New York State, USA