National Air and Space Museum
The world's most-visited museum is heavenly for adults and a must for kids. A seemingly endless assemblage of artifacts from the history of flight—from the Wright brothers 1903 flyer to the Apollo 11 space module—are exhibited here; interactive experiences run the gamut from climbing in rockets and touching moon rocks to IMAX films and heart-stopping rides in flight simulators. And, the Observatory’s 16-inch Boller and Chivens telescope, housed inside a giant dome on the east terrace, provides viewers with an intimate look at the sky by day (sun spots) and night (moon craters, Venus rings). It’s open for three hours a day Wednesday through Saturday, and during special evening programs.