No admission, but a hefty parking fee, this is a wonderful place to spend an hour or two, especially if you have kids (or adults) interested in space and air transportation. It is well organized and includes a variety of planes from early to modern, domestic to foreign as well as an interesting section on space exploration. The 'Discovery' space shuttle is located here as well as a number of rockets, simulation space rides, a air traffic control discovery area, and an elevated panoramic view of the DC area.
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