V-2 rockets falling on London were just the beginning. Had the Nazis had their way, Mach 22 bombers would have devastated America from space. The scary thing? The concept was not entirely insane. This is the story of Eugen Sänger’s Silber vogel. Nazi Germany may have lost the war but certainly not for lack of engineering genius. The sheer amount of advanced weaponry and concepts dreamed up during the Thousand-Year Reich’s 12 years in business continues to baffle the mind. 800 mm artillery pieces? Check. The world’s first jet fighter, cruise missile, and sub-orbital ballistic missile? Check, check, and check. On the other hand, look what America did: it focused most of its efforts on a single advanced weapon, moving well beyond the concept stage. But the audacity of the German weapon concepts still fascinates.