[2] The main NASM building, located on the National Mall in Washington, D.C., had always contained more artifacts than could be displayed, and most of the collection had been stored, unavailable to visitors, at the Paul E. Garber Preservation, Restoration, and Storage Facility in Silver Hill, Maryland.

The Donald D. Engen Observation Tower provides a view of landing operations at adjacent Washington Dulles International Airport.

[6] An expansion of the Udvar-Hazy Center is dedicated to the behind-the-scenes care of the Smithsonian's collection of aircraft, spacecraft, related artifacts and archival materials.

[19] The current list is maintained at the Objects On Display page of the Smithsonian Institution NASM Collections site.

Some of the museum's larger events include Air & Scare for Halloween,[21] an open house,[22] and Innovations in Flight: Family Day and Outdoor Aviation Display.