Enigma

Enigma (Wikipedia) was a World War II-era rotor machine used by Nazi Germany, amongst others, and was famously broken by Allied cryptographers.

Australia

 * Australian War Memorial, Canberra (3 rotor Enigma machine) ,
 * Powerhouse Museum, Sydney (3 rotor Enigma machine)

Belgium

 * Royal Army and Military History Museum, Brussels. Museum website The 3 rotor Heer (Army) Enigma

Canada

 * Military Communications and Electronics Museum, Kingston a 4-rotor Enigma machine,.

Germany
Both 3 and 4 rotor Enigma machines.
 * Deutsches Museum, Munich

Luxembourg

 * National Museum of Military History in Diekirch. The museum exhibits a 1941 3-rotor Heer Enigma.

United Kingdom

 * Bletchley Park, Bletchley, near Milton Keynes. In December 2004, they were exhibiting a four-wheel Naval Enigma (M4), two three-wheel Enigmas, and an "exploded" Enigma rotor display.
 * Imperial War Museum, London. A 3-wheel Enigma.
 * Science Museum, London. The museum has a three-wheel Enigma on display.
 * Mark Baldwin, itinerant lecturer. Dr Baldwin's presentations are accompanied by a four-wheel Enigma machine.
 * Royal Signals Museum, Blandford Camp, Dorset. The museum has a three-wheel Enigma on display.
 * Polish Institute and Sikorski Museum, London, which has a World War II Polish duplicate of the three-wheel Enigma.
 * HMS Belfast, London. A 4-wheel Naval Enigma.

United States

 * National Cryptologic Museum, Maryland. The museum has a number of Enigma machines on display.
 * International Spy Museum, Washington DC.
 * Computer History Museum, Mountain View, California . A 3-rotor Enigma.
 * Museum of Science, Boston. 3-wheel Enigma machine,.

Switzerland

 * Verkehrshaus, Swiss Museum of Transport, Lucerne (a 3-wheel Enigma in September 2002), see Wikipedia:de:Bild:Enigma Verkehrshaus Luzern.jpg.