A look inside the impressive feats of engineering behind Hitler's most audacious hideouts. An Alpine retreat quickly transforms into Hitler's fortified fiefdom - crowned by the awe inspiring Eagles Nest. The Wolf's Lair - a vast, secret headquarters of concrete and steel is the heart of a paranoid Hitler's plans for world domination. During the final days of the Third Reich, Berlin becomes a Fortress with the Fuhrerbunker at its core.