This beautiful castle serves as the administrative headquarters of Smithsonian Institution, the organization responsible for providing you free admission to quality museums throughout Washington DC!
Unfortunately, there is nothing to do in the castle itself. Only the first floor is open to public as an information center and cafe, but the information center was just a desk with few brochures of nearby museums. The entire first floor was not well-maintained and felt like an outdated retirement home. The only interesting thing inside the castle was the crypt of Smithson himself, the founder of the namesake institution.
Don't bother going inside the castle's security checkpoint, but do check out the beautiful garden at the back of the castle!
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