Bletchley Park

Bletchley Park in Buckinghamshire was Britain's main decryption establishment during World War Two. Ciphers and codes of several Axis countries were decrypted including, most importantly, those generated by the German Enigma and Lorenz machines.

Photo: Wrens (members of the Women's Royal Naval Service) at Bletchley with Colossus, the world's first electronic programmable computer, in 1942. (SSPL/Getty Images)