Designed by Hellmuth, Obata, and Kassabaum, who also designed the National Air and Space Museum building, the Center required 15 years of preparation and was built by Hensel Phelps Construction Co. The exhibition areas comprise two large hangars, the Boeing Aviation Hangar and the James S. McDonnell Space Hangar. The Donald D. Engen Observation Tower provides a view of landing operations at adjacent Washington Dulles International Airport. The museum also contains an IMAX theater. A taxiway connects the museum to the airport.