Bletchley Park: Station X
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"Bletchley Park [England] was the top-secret wartime base of Allied code breakers, such as Alan Turing and Dilly Knox, whose work decrypting Enigma and other enemy code systems affected the course of the Second World War." The site provides a history and virtual tour of Bletchley Park, information about the German Enigma cipher, and games for children. [A broken link]
http://www.bletchleypark.org.uk/