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

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

Bison (Bison bison) in snow, Yellowstone National Park, Wyoming, United States of America, North America

Roseata gilia (Gilia roseata) and South Window, Arches 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

Angels Window at Cape Royal on the North Rim of Grand Canyon at sunrise, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, 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

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

Mirror Lake in the Tenaya Canyon, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

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

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

Aerial view of mountains and streams in Lake Clark National Park, Alaska, United States of America, North America

Grand Canyon viewed before sunset, west of Papago Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Rock Needle, Needles District, Canyonlands National Park, Utah, United States of America, North America

Doublet Pool, Upper Geyser Basin, 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

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

Two Richardson Ground Squirrel (Citellus richardsoni), Grand Teton National Park, Wyoming, 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

Joshua tree at sunset, Joshua Tree National Park, California, United States of America, North America

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

Angels Window Overlook on North Rim of Grand Canyon at sunrise, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Travertine terraces in Mammoth hot springs terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Half Dome, Yosemite National Park, 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

Tourist boat on sea in Aialik Bay, Kenai Fjords National Park, Kenai Peninsula Borough, Southcentral Alaska, Alaska, United States of America, North America

Adult male plateau fence lizard (Sceloporus tristichus), north rim of Grand Canyon National Park, Arizona, United States of America, North America

Snowy cliffs from Peekaboo Loop Trail, Bryce Canyon National Park, Utah, United States of America, North America

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

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

Grizzly bear (Ursus horribilis), Glacier National Park, Montana, United States of America, North America

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

Hall of Mosses rainforest, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

A view of the upper Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Snowy mounds on the shore of Sprague Lake, Rocky Mountain National Park, Colorado, United States of America, North America

Bison (Bison bison) in snow, Yellowstone National Park, Wyoming, 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

Stone wall of the Window section, Arches National Park, Utah, United States of America, North America

Yosemite Falls, 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

View from Cape Royal, North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Bison calf (Bison bison), Yellowstone National Park, Wyoming, United States of America, North America

A wild burro near the Mosaic Canyon Trail in Death Valley National Park, California, United States of America, North America

Hoodoos and cliffs with snow lit by late afternoon sun, from Rim Trail near Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America

Joshua tree at sunset, Joshua Tree National Park, California, United States of America, North America

Clouds reflecting in the Yellowstone River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

An adult desert collared lizard (Crotaphytus bicinctores), basking in Grand Canyon National Park, Arizona, United States of America, North America

Rock formations, Needles District, Canyonlands National Park, Utah, United States of America, North America

A view of Natural Bridge Canyon in Death Valley National Park, California, United States of America, North America