Updated, new in bold.
United States:
1. Yellowstone, Wyoming
2. Mount Rainier, Washington
3. Zion, Utah
4. Bryce Canyon, Utah
5. Grand Canyon, Arizona
6. Yosemite, California
7. Olympic, Washington
8. Badlands, South Dakota
9. Crater Lake, Oregon
10. Grand Teton, Wyoming
11. Sequoia, California
12. Petrified Forest Arizona
13. Great Smoky Mountains, Tennessee
14.Theodore Roosevelt, North Dakota
15. Hot Springs, Arkansas
16. Wind Cave, South Dakota
17. Acadia, Maine
18. Great sand Dunes, Colorado
19. Joshua Tree, California
20. Saguaro, Arizona
21. Shenandoah, Virginia
22. Mammoth cave, Kentucky
23. Cuyahoga Valley, Ohio
24. Indiana Dunes, Indiana *
25. Gateway Arch, Missouri *
•Mount Rushmore NM, South Dakota
•Mount St. Helens National Volcanic Monument, Washington
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