Recycle PC is another Seattle shop with a cute little museum. It has old Amigas, Apples, Xerox, et al systems. Unlike the Living Computer Museum, they're not functional (or they might but, but they're turned off).

You can't look inside any of the bigger units (you'll be asked to leave if you do), but you can press the keys on the older mechanical and non-mechanical keyboards if you're a keyboard nerd.