National Postal Museum

National Postal Museum2 Massachusetts Ave. NE
Washington, DC 20560-0001
Phone: (202) 357-2700

The National Postal Museum offers a unique collection of airmail planes, stagecoaches, rare stamps and letters, Owney the Postal Dog, Pony Express exhibit, rare postage and revenue stamps. 
Open: Daily 10 a.m.-5:30 p.m. (except December 25). Group tours by appointment; call (202) 357-2991 Monday-Friday.  
Admission: Free  
Metro: Union Station  
Related Links: National Postal Museum Website