Which is why the Smithsonian Air & Space Museum built the Udvar-Hazy Center, conveniently 15 minutes from my house. Space Shuttle Discovery, SR-71 Blackbird, Concord, Enola Gay, and tons of Apollo-era space stuff, as well as the largest IMAX movie screen on the east coast. Anybody from this forum ever visits the DC area, I'd love to show them around. 
Sorry, big space geek as well as Amiga geek, I'll shut up now. 
Well, they didn't really have much choice, there isn't a basement big enough to hold that lot:)
But I am sure they still have a lot of stuff stored out of sight.