One of the best things I've ever had the privilege of doing is getting to tour the NASA Vehicle Assembly Building. It's no longer open to the public as it closed to prepare for work on getting to Mars. When I was there (About 3 years ago) it had not been open since the 70's and we were apart of the second group to get to go in. I was besides myself with glee. What's more is the Endeavor shuttle was inside waiting to be prepared for her final stop at the Smithsonian. I got to stand about 10 yards from a real space shuttle. Yes. Geek Girl Ultimate.