If you're in the vicinity of Ft. Meade, you can visit the "National Cryptologic Museum" http://www.nsa.gov/about/cryptologic_heritage/museum/index.shtml http:/

If you're in the vicinity of Ft. Meade, you can visit the "National Cryptologic Museum" http://www.nsa.gov/about/cryptologic_heritage/museum/index.shtml http://www.nsa.gov/about/cryptologic_heritage/museum/index.s... which is outside the NSA headquarters. They have old Enigma machines, which are quite compact, about typewriter size, as well as a decoder, which is more like a bank of refrigerators. And a lot of other artifacts. It seemed to be mainly a labor of love by retirees and crypto geeks, rather than some officially compiled museum. Rather touching, in a surprising way.