Da Vinci - The Genius traveling exhibit

Sex Museum in NYC? It's good for a laugh or three!

The Armstrong Air and Space Museum in Wapakoneta, Ohio. Just off I-75 between Dayton and Toledo.

At the Edison and Ford Estates (their vacation homes, sort of) in Ft. Myers, FL is a great geeky place where normal folks stroll by sedately while my GF and I would stand, point, discuss, and debate. The tours are pretty good to start with, but the best part is if you can bend the ear of a volunteer for a while with smart questions. Most of the volunteers there, as I understood, are retired scientists that respect the material reverently. Clearly, the Edison portion is heavier into the geeky, but Ford Estate has some interest for gearheads too.