1,000 campgrounds
Voyageurs National Park
Olympic National Park
Katmai National Park and Preserve
Glacier National Park
Haleakala National Park
Zion National Park
Canyonlands National Park
Mount Rainier National Park
Yellowstone National Park
Shenandoah National Park
Grand Teton National Park
Lassen Volcanic National Park
Great Basin National Park
Death Valley National Park
Mammoth Cave National Park
Saguaro National Park
