1.
Cherry Springs State Park, PA
2.
Big Bend National Park, TX
3.
Natural Bridges National Monument , UT
4.
Death Valley National Park, CA
6.
Blue Ridge Observatory and Star Park, NC
8.
Griffith Observatory, CA
9.
Chaco Culture National Historical Park, NM
11.
Great Basin National Park, NV
12.
Acadia National Park, ME
13.
Denali National Park, AK