1: 1. Grand Canyon National Park 2. Yosemite National Park 3. Yellowstone National Park
2: 4. Glacier National Park 5. Arches National Park 6. Great Smoky Mountains National Park
3: 7. Zion National Park 8. Acadia National Park 9. Rocky Mountain National Park
4: 10. Bryce Canyon National Park 11. Hawaii Volcanoes National Park 12. Shenandoah National Park
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