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
