Smithsonian Institution

Description:
Known simply as “The Castle,” the Smithsonian Institution Building is the original and most iconic building of the Smithsonian. Completed in 1855, it was the very first Smithsonian structure and remains the symbolic heart of the entire museum system. Built from distinctive red Seneca sandstone in a dramatic Gothic Revival and Romanesque-inspired style, the Castle stands out among the National Mall’s monuments and museums.

Amidst its first major renovation in more than 50 years, the Castle is temporarily reopening from May 22 through September 7, 2026, as part of the Smithsonian’s Our Shared Future: 250 programming commemorating the nation’s 250th birthday. Visitors will have a rare opportunity to step inside the historic landmark during this limited reopening period. (si.edu)

Guests can explore exhibits about Smithsonian history, gather museum maps and planning information, browse the gift shop, and relax in the nearby Enid A. Haupt Garden. The Castle is also home to the crypt of James Smithson, the British scientist whose bequest founded the Smithsonian Institution.

Why families love it
• Iconic “storybook castle” architecture kids instantly notice
• Limited-time reopening makes this a special 2026 experience
• Excellent starting point for planning a Smithsonian museum day
• Free visitor center with maps, exhibits, and helpful staff
• Beautiful gardens nearby for breaks and photos

⚠️ Good to know
• The reopening is temporary during ongoing renovations
• Some portions of the building may remain inaccessible
• There is no dedicated public parking on the National Mall
• Smithsonian Metro station is the easiest way to arrive
• The Castle itself is smaller than most Smithsonian museums

Best For
First-time Smithsonian visitors, families exploring the National Mall, architecture lovers, history enthusiasts, and anyone wanting to experience the Castle during its special America 250 reopening.

Cost: Free admission