The National Air and Space Museum’s Steven F. Udvar-Hazy Center in Chantilly, Virginia is the Smithsonian’s companion facility near Dulles, displaying thousands of aviation and space artifacts in two vast hangars. Highlights include Space Shuttle Discovery, the Lockheed SR-71 Blackbird and Concorde; the Mary Baker Engen Restoration Hangar shows active conservation, while the Donald D. Engen Observation Tower, flight simulators, IMAX and interactive experiences extend the visit. The Smithsonian says the Center opened to the public in December 2003. Current visitor guidance lists free admission, daily hours 10:00–17:30, closure on December 25, and $15 parking (free after 4 p.m.); all visitors pass security screening. Ramps, elevators, accessible restrooms, designated parking and entrance drop-off, loan wheelchairs, sensory bags and service-animal access support visitors; some programmes require advance arrangements. Confirm current attraction arrangements before travel. Visitor address: 14390 Air and Space Museum Parkway, Chantilly, Virginia 20151, United States.