Smithsonian Institution Building, The Castle.
The Smithsonian Institution Building, popularly known as the "Castle," was designed by architect James Renwick, Jr. The building is constructed of red sandstone from Seneca Creek, Maryland, in the Norman style (a 12th-century combination of late Romanesque and early Gothic motifs).
Smithsonian Institution Building, The Castle | Smithsonian …
siarchives.si.edu/history/smithsonian-institution-building-castle
siarchives.si.edu/history/smithsonian-institution-building-castle