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National Gallery of Art

East and West wings house more than 100,000 art objects from the Middle Ages to the 21st century.

1. National Gallery of Art
2. Hirshhorn Museum and Sculpture Garden  (tie) 
2. National Museum of American History (tie) 
3. National Building Museum
4. National Air and Space Museum
5. International Spy Museum
6. Phillips Collection
7. National Museum of Natural History
8. Corcoran Gallery of Art
9. Arthur M. Sackler Gallery