For everyone interested in history of information security I highly recommend visiting Bletchley Park. Among other things, visitors can explore legendary British WW2 Codebreaking Huts, learn more about the cryptography and the Enigma machine in particular.
There is even a computer simulation available that explains in simple terms the basic principles behind the device.
Some interesting facts about Alan Turing and more modern exhibitions definitely sparkle the curiosity of any visitor.
