04.07 14:00
60 Min
Nazi Megastructures
One of the greatest fortifications in warfare history, the campaign to breach Hitler's Siegfried Line cost 140,000 American casualties. (Nat Geographic HD)
05.07 14:00
60 Min
Nazi Megastructures
Hitler transformed his Alpine retreat in Bavaria into a fortified fiefdom, home to 2,000 SS troops and protected by a high level security system. (Nat Geographic HD)