10 most-visited U.S. national parks

MOST-VISITED U.S. NATIONAL PARKS Based on visits in 2010 reported by the National Park Service Public Use Statistics Office:

1. Great Smoky Mountains

2. Grand Canyon

3. Yosemite

4. Yellowstone

5. Rocky Mountain

6. Olympic

7. Grand Teton

8. Zion

9. Acadia

10. Cuyahoga Valley