I would love to visit Bletchley Park and see Colossus. Now that it isn't top secret any more, it is becoming legendary. I agree with what others have said, that it will take time to revise history regarding ENIAC.

If you find yourself in Silicon Valley, don't miss the Computer History Museum in Mountain View. (Shameless plug: I am a volunteer there.) We've got some amazing stuff too, although no ENIAC. We have a restored DEC PDP-1 on which I have played Space War (the first videogame, 1962), and thousands of other computers and artifacts.

We are currently preparing for major renovations to our former SGI building, but some exhibits and tours will be available during construction. For instance, we are now setting up a Babbage Difference Engine kindly loaned to us from the UK.