National Postal Museum

"By the time you read this, in 2012, the Postal Museum should have expanded to add a 12,000-square-foot gallery at street level." Full review

"Audio-visual and interactive presentations in this family-friendly museum detail the invention and history of stamps, the postal service, the role of letters as a means of communication." Full review

"The Smithsonian's stamp collection, housed here, consists of more than 6 million stamps." Full review

"This Smithsonian Institution museum houses the world's largest philatelic collection and chronicles America's mail service from colonial times to the present." Full review

"Head downstairs to tour the original part of the museum, where America’s postal history from 1673 to the present is on display." Full review

"Opened in 1993, the National Postal Museum’s exhibits and programs are focused on the preservation and study of postal history from colonial times to the present"