Smithsonian National Museum of American History
- A collection of more than 3 million artifacts displayed in exhibits and within the archives that focuses on American history and culture, and includes public and educational programs.
- http://americanhistory.si.edu/

National Postal Museum
- Dedicated to the preservation, study and presentation of postal history and philately through stamps and objects.
- http://www.postalmuseum.si.edu/

International Spy Museum
- The story of spies, intelligence operations and deceptions that changed the course of history.
- http://www.spymuseum.org/