Smithsonian_Castle_Aerial_highsmith

Smithsonian Castle Aerial, Washington, D.C. The Smithsonian Institution Building, located on the National Mall in Washington, D.C. behind the National Museum of African Art, houses the Smithsonian Institution’s administrative offices and information center. The building is constructed of red Seneca sandstone in the faux Norman style (a 12th-century combination of late Romanesque and early Gothic motifs) and is appropriately nicknamed The Castle. It was designated a National Historic Landmark in 1965.