National Postal Museum

The National Postal Museum, located opposite Union Station in Washington, D.C., USA, was established through joint agreement between the United States Postal Service and the Smithsonian Institution and opened in 1993. The museum is located across the street from Union Station, in the building that once served as the Main Post Office of Washington, D.C. from 1914, when it was constructed, until 1986. The building was designed by the Graham and Burnham architectural firm, which was led by Ernest Graham following the death of Daniel Burnham in 1912.

• http://en.wikipedia.org/wiki/National Postal Museum