Smithsonian Castle Enid A Haupt Garden Washington DC // WASHINGTON DC — The Smithsonian Castle is viewed through the Enid A. Haupt Garden on the National Mall in Washington, D.C. The red sandstone castle, completed in 1855, serves as the Smithsonian Institution's headquarters and visitor center. The 4-acre Haupt Garden, featuring formal plantings and fountains, was opened in 1987 as part of the Quadrangle Complex.

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