National Postal Museum (former City Post Office building)

The Smithsonian National Postal Museum, located in the historic City Post Office building near Union Station, opened in 1993 and interprets the history of the U.S. postal system, philately, and the social role of mail. The museum's collections include millions of postal artifacts, stamps, and historic postal vehicles, and it offers exhibits on postal service technology, design, and cultural impact. The building itself is a prominent early 20th-century federal postal facility adapted for museum use.