The Air & Space museum in downtown DC is amazing, but you must see this one too - it has at least 100 planes, and a bunch of astronaut items, barnstorming planes, some helicopters, etc. There were 2 things that I really wanted to see - a Space Shuttle (Discovery is there) and a Concorde, which they also have. I did not know this ahead of time but the Enola Gay is there too. Then there are a million other little planes of all vintages. They also have a restoration area with an overlook where you can see them working on current projects. There's an observation deck way high up (didn't do that). They have a McDonalds there if you get hungry. The gift shop has quite a few books and DVDs in addition to the t-shirts and cheap Chinese crap.
NOTE -> There is a $15 parking fee per car, but no admission charge for the museum, so go in a big car and pack in as many people as possible.
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