http://www.bletchleypark.org.uk/ Is the website too.

Like has been said it's easy to get to and worth the trip if you're into the history of computer science.

I went a year ago and it was very inspirational and the perfect antidote to startup BS and all that NSA stuff. Around the time i went i was reading a book about the history of cryptography and it was great linking everything together!

It's just a shame Alan was treated the way he was although the letter from Gordon Brown PM in the main museum is definitely worth a look for any LGBT history guru!