minor nitpick: the Udvar-Hazy (http://www.nasm.si.edu/udvarhazy/) center over near Dulles Airport opened right at the end of 2k3, and they've added all kinds of things since then. Personally, I find it particularly stunning and profound (I wrote about that here (http://thegameiam.livejournal.com/159912.html)) - Anyone who travels in through Dulles Airport should make a stop there...