Smithsonian reopens oldest building for America 250 before renovations resume

Published May 23, 2026 5:00am ET | Updated May 23, 2026 10:45am ET



The Smithsonian Institution is taking a break from construction on its oldest building, which opened to the public for America 250 on Friday.

The Smithsonian Institution Building, commonly known as the Castle, has been out of commission since 2023 for renovations. That work will be paused until Sept. 7, giving visitors time to explore the iconic landmark as the nation marks its 250th anniversary of independence this summer.

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