Description: The National Postal Museum was established in 1990 under an agreement between the Smithsonian and US Postal Service to preserve and display the National Philatelic Collection, formerly part of the National Museum of American History. The Postal Museum moved to the Washington City Post Office Building on Capitol Hill in 1993. History of the National Postal MuseumAdditional
Description: The National Air and Space Museum was established in 1946 to care for the Smithsonian’s growing aeronautical collections. On July 1, 1976, a new building opened on the National Mall to showcase the collection. In December of 2003, the Udvar-Hazy Center opened near Dulles Airport in Virginia to display additional collections. History of the National Air and Space