Lucky enough to visit the Steven F. Udvar-Hazy Center last week and have a guided tour.What a collection, they have too much (extension required please!).
Great to see such historic aircraft and spacecraft including the Enola Gay, Lockheed SR-71 Blackbird, a Concorde with my favourite exhibit being Space Shuttle Discovery.
Seeing the Atlantis display at Kennedy Space Center spoils you, but Discovery is a magnificent craft. You get the opportunity to get up close and personal. I didn't touch it!
Hidden away too was Apollo 11 command module Columbia, in terms of history for a space fan well. I thought it would be on display at the National Air and Space Museum (Mall). Apparently it has been readied here for a national tour.