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Washington, D.C., District of Columbia / Museums

Smithsonian Institution Building

Known as The Castle, this striking red sandstone landmark is the oldest building of the Smithsonian Institution, serving as a historic gateway and administrative hub on the National Mall.

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Smithsonian Institution Building
www.si.edu, og_image_www.si.edu

What is the Smithsonian Institution Building known for?

Commonly called the Smithsonian Castle or The Castle, it is the Smithsonian's first and oldest building and serves as a symbol of the institution. It is a National Historic Landmark constructed of Seneca red sandstone in the Norman Revival style.

What are the hours and is it open to the public?

The building closed on February 1, 2023, for a major renovation, though part of the first floor remains open. It is scheduled to temporarily reopen to the public from Memorial Day through Labor Day in 2026.

What can I see or do there?

The building houses Smithsonian administrative offices and an information center. During its 2026 reopening, it will feature a visitor center, café, shop, and a special exhibition titled "American Aspirations."

How do I get there?

The Castle is located on Jefferson Drive SW near Independence Avenue. The nearest Metro station is the Smithsonian station (Mall exit), accessible via the Orange, Blue, and Silver lines.

Who designed the building and when was it built?

The building was designed by architect James Renwick, Jr. Construction began in 1846 and was completed in 1855.

What should I check before going?

Use Gyde for context, then check official sources for current hours, tickets, construction, and closures.

What to know

The Smithsonian Institution Building, colloquially known as The Castle, stands as the first and oldest home of the Smithsonian Institution. Construction on this architectural landmark began in 1846 and reached completion in 1855. Designed by the renowned architect James Renwick, Jr., the building was designated a National Historic Landmark in 1965, cementing its status as a symbol of American intellectual pursuit. The structure is celebrated for its distinct Norman Revival style, which blends 12th-century late Romanesque and early Gothic motifs. Its striking exterior is constructed from Seneca red sandstone extracted from Poolesville and Seneca Creek, Maryland. This bold coloration makes it one of the most recognizable buildings on the National Mall. Today, the building primarily houses Smithsonian administrative offices and the Smithsonian Information Center. While it serves as a resource hub for visitors to all Smithsonian museums, it has recently undergone its first major renovation in over 50 years, having closed for this extensive work on February 1, 2023. Visitors can look forward to a temporary reopening from Memorial Day through Labor Day in 2026. During this window, the building will feature a visitor center, a café, a shop, and a special exhibition titled American Aspirations, providing a rare opportunity to explore the interior of this historic site.

Visitor tips

  • Use the Smithsonian Metro stop (Mall exit) for the most direct access to the building.
  • If visiting during the 2026 reopening, plan to visit between Memorial Day and Labor Day to access the café and special exhibition.
  • Explore the Castle online via the Virtual Visitor Center if the building is closed for renovation during your visit.

Nearby context

Located on Jefferson Drive SW near Independence Avenue, The Castle serves as a historic anchor on the National Mall, situated conveniently near the Smithsonian Metro station.

Sources

Evidence and links