This museum is magnificent! It contains dozens of aircraft at three levels in a huge hangar-size building located adjacent to Dulles International Airport. They have it all-from hang gliders to the Concorde; from small rockets to space craft; from World War One bi-planes to the new F-35A attack aircraft. Admission is free, but there is a $15 parking fee. However, most nearby hotels offer free shuttles to the museum. Do not miss this if you are in the area.