Smithsonian Institution Building

The Smithsonian Institution Building is a Romanesque Revival administrative structure on the National Mall in Washington, D.C., built of red sandstone. The complex stretches across multiple connected sections with towers, arches, and a central courtyard surrounded by arcades.

James Renwick Jr. won a nationwide competition in 1846 to design this structure, which opened in 1855 as the institution's headquarters. A fire in 1865 destroyed much of the interior, which was later restored with simplified decoration.

The building functions as a central visitor hub for the Smithsonian museums and displays rotating pieces from the institution's collections. It is nicknamed the Castle because of its medieval towers and battlements that recall a European fortress.

The structure is closed until 2028 for major renovation work, including restoration of the Grand Hall and upgrades to building systems. Visitors can view the exterior facade from the Mall and explore other Smithsonian museums nearby.

The crypt of James Smithson sits inside the north entrance, even though the British scientist who funded the institution never set foot on American soil. His remains were brought from Italy to Washington in 1904, more than half a century after his death.

Location: Washington, D.C.

Inception: 1849

Architects: James Renwick Jr.

Official opening: 1855

Architectural style: Romanesque Revival architecture

Floors above the ground: 4

Made from material: red sandstone

Operator: Smithsonian Institution

Part of: Smithsonian Institution

Address: 1000 Jefferson Dr SW, Washington, DC 20560

Opening Hours: Monday-Sunday 8:00-17:30

Website: https://si.edu/Museums/smithsonian-institution-building

GPS coordinates: 38.88875,-77.02600

Latest update: December 14, 2025 19:16