National Air and Space Museum’s massive hangar-like facility near Dulles International Airport displays 160-plus aircraft. The Enola Gay (first to drop an atomic bomb) and an F-4 Phantom. Ongoing exhibitions like “Transformers: More Than Meets the Eye!” IMAX theater, flight simulations. IMAX tickets: $7.50-$15. Theater info: 866.868.7774. Parking ($15) or Fairfax Connector No. 983 between Dulles Airport and museum. Daily 10 am-5:30 pm. Free.