Denali National Park, Daniel A. Leifheit (Getty)
Grand Canyon National Park, Erik Avent (Getty)
Yosemite National Park, Sapna Reddy (Getty)
Kings Canyon National Park, JTBaskin Photo (Getty)
Sequoia National Park, Quan Yuan (Getty)
Joshua Tree National Park, Kyle Hammons (Getty)
Rocky Mountain National Park, Brad McGinley (Getty)
Acadia National Park, CFW Photography (Getty)
Glacier National Park, Feng Wei (Getty)
Canyonlands National Park, Jeff Clow (Getty)
Bryce Canyon National Park, Nguyen-Anh Le (Getty)
Arches National Park, Jacob Frank (Getty)
Zion National Park, Sean Gallup (Getty)
Shenandoah National Park, Pierre Leclerc (Getty)
Olympic National Park, Mint Images (Getty)
Mount Rainier National Park, Chase Dekker (Getty)
Grand Teton National Park, Matt Anderson (Getty)