I just finished looking at a program on Discovery about Nazi Germany's plans to drop a low-altitude dirty bomb (bomb section surrounded with radioactive sand/silica) on NYC or Washington towards the last part of the war in Europe. It was interesting to see the vehicles that the three engineer/scientists- von Braun, Horten and Sanger were each working on to deliver a single dirty bomb. Wow! The Horten Bros flying wing that was designed to use 6 turbojet engines was a beautiful design. The program said that at the war's end, that aircraft would have been fully operational within 2 years had the war stretched out that far. Think about it. Roughly 3,500 miles to NYC and the 3,500 miles back, as well as some slop added in the event the aircraft had to divert was really some very forward thinking at the time. Horten was relying on the flying wing's less drag design to be the thing to make it all possible. Von Braun's design was basically a V-2 with stub wings. The method to launch that thing into low orbit was something else. A rail system with a booster section to push the thing down the track until it reach approx 6,000 miles per hour, thus slingshoting the thing up 120 miles and re-enter on a suicide attack to explode over NYC. Sanger's design was way too advanced for the time. He was seeking to put the aircraft into a low orbit, drop the payload in an arc from Pittsburgh and then push on through to the other side of the world to land in Germany.
If you haven't seen the program, definitely catch it.