It turns out that the Nazis had the same technology used in the B-2 Spirit Stealth Bomber more than 30 years before the Americans started developing it. The Horten Ho 2-29 has been recently reconstructed using blueprints and the only remaining prototype from 1944- one of only 3 prototypes. The replica can’t fly but the technology works.
The plane, back in 1944, had working radar-invisible technology. It’s also quite a bit smaller than the B-2.
Stories like this are interesting, because if you put things in perspective: Hitler could have very well ruled the world with his superior technology. During World War II, Germany had some of the most advanced weaponry- a lot of which is used today, and if Hitler had sought out economic domination instead of declaring war, he may have been ruling the world today… or his successor would have; he’d probably be dead by now, either way.
EDIT: This site has a load of great pictures of the Horten Ho 2-29 from when it was still in development and of the new replica.