Guided missiles, the Wasserfall, and the war-changing V2 were dreamed up and tested in Peenemunde, a German seaside city suddenly overtaken by Nazi elite. Along the Baltic coast, scientists like Wernher von Braun, designed and tested weapons to bring the Allies to their knees.

In Poland lies a forgotten Nazi complex which could have sheltered up to 27,244 people from Allied bombs, the purpose of which largely remains a mystery.