Computer History Museum, Mountain View

They had literally tons of great-interest items like: 1-The Neiman Marcus Kitchen Computer 2-A Cray-1 supercomputer 3-The history of storage devices including disk drives the size of a refrigerator that couldn't hold one-thousandth as much as today's iPod You can see displays of the history of computing from ancient times through modern times. This is very educational. Also people who grew up with computers like myself will love to see the early models they worked with on display - like seeing an old friend again! The staff is very knowledgeable and friendly. I suggest going when you can take a guided tour to get the most out of it. And then wander around by yourself to spend time with what interests you most.