The Smithsonian Institution Building, more commonly known as the Smithsonian Castle or simply The Castle, is a building on the National Mall housing the Smithsonian Institution's administrative offices and information center.

The Smithsonian Institution Shelter, also known as the Mount Whitney Summit Shelter and the Mount Whitney Hut, was built in 1909 on the summit plateau of Mount Whitney, in the Sierra Nevada within Sequoia National Park, in California.