[ryan-c]

Neat. There is also https://www.nsa.gov/about/cryptologic_heritage/museum/ which I've been to, and recommend people check out if they're ever in the area, though the hours suck.

[mturmon]

Seconded. It's just outside Ft. Meade. They have an Enigma machine (a small device) and the "Bombe" (much larger) that decoded it.

https://www.nsa.gov/about/photo_gallery/index.shtml#machines