Air and Space Museum on the Mall would. But there is another one, an annex right by Dulles Airport that we like even better. Both are not to be missed museums. You can do both in a day if you are extremely ambitious and without little children. But it should be split it into two days to really take in these two museums. There's a lot to see and a lot of info on history of flight, aeronautics, space, wars, commercial aviation and countries in addition to the USA.
Sheryl nailed it.
Definitely visit Air and Space Museum (which is FREE!!!)
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