I was hoping people would mention the Living Computers museum, I had a chance to visit on a short trip to Seattle a couple of weeks ago and in the space of about 45 minutes I played a game of chess with a PDP-8 entering moves on a working teletype, wrote some BASIC on an original working Apple I and Altair, played a maze game on a Xerox Alto and played around with the fascinating UI on a NeXTstation. Capped it off with a game of Oregon Trail on a Mac SE.

I'm so grateful that people like Paul invested in giving people the means to interact with such iconic machines and kept them running - the value of places like this is immense.