The Smithsonian Castle Throws Open Its Doors for America’s 250th Summer

For the first time in more than three years, visitors are once again climbing the steps of the Smithsonian Castle. The distinctive red sandstone landmark on the National Mall — the oldest of the Smithsonian's buildings, completed before the Civil War and now 171 years old — reopened to the public for the summer of 2026, offering the country a warm welcome back to one of Washington's most beloved cultural touchstones.

The Castle closed in early 2023 for its first major renovation in more than half a century, a sweeping project to replace aging mechanical systems, improve accessibility and shore up the historic structure for another century of use. Rather than keep the doors shut for the entire multi-year effort, the Smithsonian chose to pause the work and reopen the building over the summer, from Memorial Day weekend through September 7, so the public could enjoy it during the height of the visitor season.

“The distinctive red sandstone landmark on the National Mall — the oldest of the Smithsonian's buildings, completed before the Civil War and now 171 years old — reopened to the public for the summer of 2026, offering the country a warm welcome back to one of Washington's most beloved cultural touchstones.”

Inside, the restored Great Hall is the star. Visitors can take in its exposed brick vaulting and newly cleaned marble columns, alongside a visitor center and interpretive displays that trace the Castle's history, its transformation and its future. The timing is deliberate: the reopening is woven into preparations for America 250, the nationwide celebration of the country's 250th anniversary, giving the historic building a fresh role as a gathering point for reflection on the national story.

The centerpiece is a special exhibition, “American Aspirations,” drawing on the Smithsonian's vast collections to tell that story through objects. Among the treasures on view are President Thomas Jefferson's desk and a flight suit worn by the pioneering aviator Amelia Earhart — everyday and extraordinary artifacts that together sketch a portrait of American ambition and invention across the centuries.

Visitors have responded with delight. “The fact that this building is this old and is so immaculately maintained is so impressive,” said one, Baylor Barnett, capturing the mood of a public glad to have the landmark back. After Labor Day, the Castle will close again to complete its renovation, but for one bright summer it is fully alive — proof that even in the middle of a long restoration, institutions can find generous ways to keep sharing their treasures with the people they serve.