Smithsonian - National Postal Museum

The Smithsonian's National Postal Museum is located in the historic City Post Office Building, which was constructed in 1914 and served as the Washington, D.C., post office from 1914 through 1986. The Museum occupies 100,000 square feet of the building with 35,000 square feet devoted to exhibition space. The Museum also houses a 6,000-square-foot research library, a stamp store and a museum shop.