The Air & Space Museum in Dulles, VA is even better than the one in Washington DC! It's a well-designed, open museum that allows you to view the aircraft from multiple angles. This museum now houses the Space Shuttle Discovery, which is worth the visit. The museum is very easy to navigate even with children and strollers, and there are changing stations available for little ones.
It's free to visit this museum, but parking costs $15 per vehicle. However, if you go at 4pm parking is free, the crowds are smaller, and the museum is open until 5:30pm.
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