The Bletchley Park British Turing Bombe, used to crack the German Enigma machines
The Bletchley Park British Turing Bombe, used to crack the German Enigma machines - An article outlining the rebuild of this device from blueprints, etc. This is one of the most stunning electromechanical achievements of our time - it is said to have shortened world war II by two years.
More about Bletchley Park here.