Across
- 2. Mount Rainier National Park
- 4. Bryce Canyon National Park
- 6. Acadia National Park
- 9. Redwood National Park
- 11. Isle Royale National Park
- 12. Death Valley National Park
- 14. Carlsbad Caverns National Park
- 16. Big Bend National Park
- 18. Grand Canyon National Park
- 19. Everglades National Park
- 20. Denali National Park
- 21. Great Sand Dunes National Park
- 23. Great Basin National Park
- 26. Rocky Mountain National Park
- 28. Olympic National Park
- 29. Mammoth Cave National Park
- 30. Dry Tortugas National Park
- 31. Badlands National Park
Down
- 1. Glacier National Park
- 2. Grand Teton National Park
- 3. Joshua Tree National Park
- 5. Great Smoky Mountains National Park
- 7. Zion National Park
- 8. Shenandoah National Park
- 9. Yosemite National Park
- 10. Yellowstone National Park
- 13. Hot Springs National Park
- 15. Voyageurs National Park
- 17. Yellowstone National Park
- 22. Crater Lake National Park
- 24. Glacier Bay National Park
- 25. Yellowstone National Park
- 27. Great Smoky Mountains National Park