The National Cryptologic Museum in Baltimore, USA 327
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The National Cryptologic Museum features exhibits that show the history of American cryptology from the times of the American Revolutionary War until modern days. One of the most famous objects exhibited here is the Enigma German cipher machine used during the World War II.
There is a library in the museum. Excursions here are held by retired National Security Agency employees. Interactive and educational programs, trainings for children older than 9 years old, and boy scouts trainings are also included in the event calendar of the museum.