Alex and everyone else has mentioned this recently and we even mentioned it before… anyway we know have the famous huts on readersheds.co.uk
Hut 6, scene of some of the most profoundly important work of the twentieth century, the top secret breaking of German Army and Air Force Enigma ciphers by the brilliant Bletchley Park Codebreakers. Now very sadly in desperate state of decay and on the verge of collapse.
Their website is here You can also follow them on Twitter @bletchleypark