Mark and I visited the Dulles Air and Space Museum during our trip to Virginia. The museum is a huge hangar that houses all of the planes and space artifacts that don't fit in the DC museum space including the Enola Gay and the Space Shuttle Enterprise. It is a definitely must-see, probably even better than the DC one, but bring a snack because the only food is McDonalds. Also, good to know, an IMAX movie in VA is cheaper than a normal movie in NY.
All photos taken by Mark, obviously. See more here! And here!