The Computer History Museum in Mountain View, CA is a magical place if you're at all interested in the history of computing and digital technology. The best way to experience it is, of course, to visit in person. Thanks to a project dubbed #OpenCHM, you can now also explore plenty of the museum's vast collection online!
A blog post, "A Collection Unbound" provides some neat behind-the-scenes info on OpenCHM, and makes for a good starting point of your explorations: