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Sand dunes with grasses and ridges in foreground, Great Sand Dunes National Park, Colorado, United States of America, North America

Bighorn Lake, Bighorn Canyon National Recreation Area, Wyoming, United States of America, North America

American Falls in the winter, Niagara Falls, New York State, United States of America, North America

Red sandstone cliffs in the Capitol Reef National Park, Utah, United States of America, North America

Cold lava walls in the Craters of the Moon National Park, Idaho, United States of America, North America

The colourful sandstone formations of the Bryce Canyon National Park in the late afternoon, Utah, United States of America, North America

Walkway through cold lava in the Craters of the Moon National Park, Idaho, United States of America, North America

Jackson Lake in the Teton range in the Grand Teton National Park, Wyoming, United States of America, North America

Road leading in the Teton range in the Grand Teton National Park, Wyoming, United States of America, North America

Early morning sunlight shining on the towering cliffs of the Zion National Park, Utah, United States of America, North America

Late sunlight glowing on the rocks of the Zion National Park, Utah, United States of America, North America

Trekkers walking along the Slickrock trail near, Moab, Utah, United States of America, North America

A forest fire destroys an area of forest in Yosemite Valley in the Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Yosemite Falls, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Rock face and waterfalls, Emerald Pools, Zion National Park, Utah, United States of America, North America

Sand dunes at dawn, Great Sand Dunes National Park, Colorado, United States of America, North America

Yellowstone National Park in winter, UNESCO World Heritage Site, Wyoming, United States of America, North America

Sunset behind Mirror Lake, Gunnison National Forest, Colorado, United States of America, North America

Erosion patterns in a small drainage, Bisti Wilderness, New Mexico, United States of America, North America

The colourful Grand Canyon of the Yellowstone, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

View over the Zion National Park from Angel's Landing, Zion National Park, Utah, United States of America, North America

The colourful sandstone formations of the Bryce Canyon National Park in the late afternoon, Utah, United States of America, North America

Beautiful red sandstone formations in the Arches National Park, Utah, United States of America, North America

Road leading through the Grand Staircase Escalante National Monument, Utah, United States of America, North America

View over the Lewis River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

View of rock formations and flora in Red Rock Canyon National Recreation Area, Las Vegas, Nevada, United States of America, North America

Half Dome, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Yosemite Falls, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Colorado chipmunk (Eutamias quadrivittatus), Rocky Mountain National Park, Colorado, United States of America, North America

Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bisons, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

North Clear Creek Falls, Rio Grande National Forest, Colorado, United States of America, North America

Golden-mantled squirrel (Citellus lateralis), Rocky Mountain National Park, Colorado, United States of America, North America

Redrock sandstone formations in the Kodachrome Basin State Park, Utah, United States of America, North America

Sol Doc River, Olympic National Park, UNESCO World Heritage Site, Washington, United States of America, North America

The colourful sandstone formations of the Bryce Canyon National Park in the late afternoon, Utah, United States of America, North America

Walkway through cold lava in the Craters of the Moon National Park, Idaho, United States of America, North America

The colourful sandstone formations of the Bryce Canyon National Park in the late afternoon, Utah, United States of America, North America

Half Dome viewed from Glacier Point, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Cathedral Rocks from Yosemite Valley, UNESCO World Heritage Site, California, United States of America, North America

Half Dome, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Yosemite Falls, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Sand dunes at dusk, Great Sand Dunes National Park, Colorado, United States of America, North America

Sipapu Natural Bridge, Natural Bridges National Monument, Utah, United States of America, North America

Tourists on the brink of American Falls, Niagara Falls, New York State, United States of America, North America

American Falls frozen over in winter, Niagara Falls, New York State, United States of America, North America

South Window Arch seen through Turret Arch, Arches National Park, Utah, United States of America, North America

Kayaking and rafting down the Colorado River, Castle Valley, near Moab, Utah, United States of America, North America

Half Dome, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America