The Bletchley Park manor was build shortly after 1883 for financier and politician sir Hubert Leon, mixing architectural styles of Tudor, Dutch Baroque and Victorian Gothic.

It was used during WW2 as the top secret home of allied code-breaking. There they regularly decoded Axis powers, Lorenz cipher and the German Enigma. It became the principal home of allied code-breakers and thanks to the highly intelligent teams put together there, the first electronic programmable digital computer, Colossus, was created. This machine helped shorten the war by 2 to 4 years according to British intelligence.

The vital work carried out here was stopped in 1946 and remained secret until the mid 1970's. The visits are particularly interesting and well put together.

It can be found in Bletchley, close to Milton Keynes in Buckinghamshire.