Across
- 3. Carlsbad Caverns National Park
- 6. Isle Royale National Park
- 7. Mammoth Cave National Park
- 10. Crater Lake National Park
- 11. Cuyahoga Valley National Park
- 12. George Rogers Clark National Park
- 13. Guadalupe Mountains National Park
- 15. Cape Henlopen State Park
Down
- 1. Gateway Arch National Park
- 2. Theodore Roosevelt National Park
- 4. Acadia National Park
- 5. Hot Springs National Park
- 8. Mesa Verde National Park
- 9. Glacier National Park
- 14. Shoshone Falls Park