Updated, new in bold.
United States:
1. Yellowstone, Wyoming
2. Zion, Utah
3. Bryce Canyon, Utah
4. Grand Canyon, Arizona
5. Yosemite, California
6. Badlands, South Dakota
7. Grand Teton, Wyoming
8. Sequoia, California
9. Petrified woods, Arizona
10. Great Smokey Mountains, Tennessee
11. Theodore Roosevelt, North Dakota
12. Wind Cave, South Dakota
13. Acadia, Maine
14. Great sand Dunes, Colorado
15. Joshua Tree, California
16. Saguaro, Arizona
•MT Rushmore NM, South Dakota
International:
Sanjay Gandhi , Mumbai, India
Arenal Volcano , La Fortuna, Costa Rica
Manuel Antonio, Quepos, Costa Rica
Carara,Costa Rica
Plitvice Lakes, Croatia
Iguazú, Puerto Iguazu, Argentina
Iguaçu, Foz do Iguaçu, Brazil
Soberanía, Panama
Portobelo, colon, Panama
Metropolitan NP, Panama city,Panama
Masada, Israel
Ein Gedi Antiquities,Israel
Yarkon, Israel