If you have even a mild interest in aviation and/or space exploration, this is a must-visit museum. Absolutely first-class layout, displays and staff. I took my pilot-in-training son with me and we didn't want to leave. Fantastic IMAX theater layout and movie choices--we saw, and loved "Fighter Pilot." The only, very minor downside was the loooonnnnggg line at the museum store checkout counter, which precluded us buying anything. Go!
If you own or manage Smithsonian National Air and Space Museum, register now for free tools to enhance your listing, attract new reviews, and respond to reviewers.