Smithsonian Castle Red Sandstone Norman Revival Washington DC United States // WASHINGTON D.C., United States — Lush foliage frames the asymmetrical towers and red sandstone facade of the Smithsonian Institution Building along a curved brick garden pathway. Designed by architect James Renwick Jr. and completed in 1855, the structure exemplifies the Norman Revival architectural style, characterized by its blend of late Romanesque rounded arches and early Gothic motifs. The building's signature masonry consists of Seneca red sandstone quarried in nearby Montgomery County, Maryland, a material ch

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