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Hikers on the sand dunes, Great Sand Dunes National Park and Preserve, with Sangre Cristo Mountains in the background, Colorado, United States of America, North America

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

Coyote (Canis latrans) in the snow, Yellowstone National Park, Wyoming, United States of America, North America

A cowboy wrangler leads a pack train of horses up the South Kaibab Trail in Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Johns Hopkins Inlet, Fairweather Range, Glacier Bay National Park and Preserve, Southeast Alaska, United States of America, North America

Johns Hopkins Glacier calving, Fairweather Range, Glacier Bay National Park and Preserve, Southeast Alaska, United States of America, North America

Sunrise over El Capitan and Yosemite Valley from Tunnel View, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Chaco Culture National Historic Park, World Heritage Site, Fajada Butte, UNESCO World Heritage Site, New Mexico, United States of America, North America

Chaco Culture National Historic Park, World Heritage Site, Hungo Pavi, UNESCO World Heritage Site, New Mexico, United States of America, North America

Lower Calf Creek Falls, Grand Staircase-Escalante National Monument, Utah, United States of America, North America

Barn, Thomas Alma and Lucille Moulton Homestead, Mormon Row Historic District, Grand Teton National Park, Wyoming, United States of America, North America

Mesa Arch sunrise, Island in the Sky, Canyonlands National Park, Utah, United States of America, North America

Pipe Creek Vista Point Overlook, South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand View Point overlook and juniper tree, Island in the Sky, Canyonlands National Park, Utah, United States of America, North America

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

Hoary marmot (Marmota caligata), Glacier National Park, Montana, United States of America, North America

Mountain goat (Oreamnos americanus), Mount Evans, Arapaho-Roosevelt National Forest, Colorado, United States of America, North America

Parry's primrose (Primula parryi), San Juan National Forest, Colorado, United States of America, North America

Gifford Farm House, Fruita, Capitol Reef National Park, Utah, United States of America, North America

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

First light on a cluster of yucca among the dunes, White Sands National Monument, New Mexico, United States of America, North America

Snow pillows on the Dolores River, San Juan National Forest, Colorado, United States of America, North America

Lizard Head in the winter, Uncompahgre National Forest, Colorado, United States of America, North America

Cracked sand dune with a yucca, White Sands National Monument, New Mexico, United States of America, North America

Bull elk (Cervus canadensis) in the snow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Black bear (Ursus americanus) in a spring snow storm, Yellowstone National Park, Wyoming, United States of America, North America

Tenaya Lake on the Tioga Pass in Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Coyote (Canis latrans) in the snow in winter, Yellowstone National Park, Wyoming, United States of America, North America

Golden cottonwood trees on banks of the Virgin River, Zion National Park, Utah, United States of America (U.S.A.), North America

Regenerating trees reflected in a frosty and misty Lewis River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Sapphire Pool, Biscuit Basin, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

Man looking at Mount Rainier from trail, Mount Rainier National Park, Washington State, United States of America, North America

Wildflowers and mountains near Cinnamon Pass, Uncompahgre National Forest, Colorado, United States of America, North America

American Robin (Turdus migratorius), Yellowstone National Park, Wyoming, United States of America, North America

A sandstone butte in Chaco Culture National Historical Park scenery, New Mexico, United States of America, North America

Grizzly bear (Ursus arctos horribilis) sow, Yellowstone National Park, Wyoming, United States of America, North America

The Tetons at dawn after a fresh snow, Grand Teton National Park, Wyoming, United States of America, North America

Bison (Bison bison) cow in the winter, Yellowstone National Park, Wyoming, United States of America, North America

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

Black bear (Ursus americanus), Yellowstone National Park, Wyoming, United States of America, North America

Red fox (Vulpes vulpes) in the snow, Grand Teton National Park, Wyoming, United States of America, North America

Bull elk (Cervus canadensis) feeding in the winter, Yellowstone National Park, Wyoming, United States of America, North America

The Teton Range at dawn after a fresh snow, Grand Teton National Park, Wyoming, United States of America, North America

Snake River at the Schwabacher Landing, Grand Teton National Park, Wyoming, United States of America, North America

Snake River at the Schwabacher Landing, Grand Teton National Park, Wyoming, United States of America, North America

Porcelain Springs, Porcelain Basin, Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Pinwheel Geyser, Porcelain Basin, Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

View of Duck Lake and Yellowstone Lake at dusk from near West Thumb, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Abyss Pool, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Abyss Pool, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Colorado chipmunk (Eutamias quadrivittatus) eating, San Juan National Forest, Colorado, United States of America, North America

Last light on Half Dome above Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Two sub-adult grizzly bears (Ursus arctos horribilis), Glacier National Park, Montana, United States of America, North America

Cinnamon-colored black bear (Ursus americanus) walking, Yellowstone National Park, Wyoming, United States of America, North America

Beaver (Castor canadensis) eating an evergreen branch, Yellowstone National Park, Wyoming, United States of America, North America

Pyrrhuloxia (Cardinalis sinuatus) female, Chiricahuas, Coronado National Forest, Arizona, United States of America, North America

Black bear (Ursus americanus) in the snow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Clouds reflected in a pond, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

Two Grizzly Bear (Ursus arctos horribilis) cubs of the year or spring cubs playing, Yellowstone National Park, Wyoming, United States of America, North America

Trees on a hillside covered with fog, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Yellowstone River near Calcite Springs, Yellowstone National Park, UNESCO Wortld Heritage Site, Wyoming, United States of America, North America

Time exposure at night, Joshua Tree National Park, California, United States of America (U.S.A.), North America

Rocks covered with lichen, Deer Park, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America (U.S.A.), North America

Pines at Mystic Falls, near Biscuit Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Ice encrusted dead trees against clear skies, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Mormon Row barn, Antelope Flats, Grand Teton National Park, Wyoming, United States of America, North America

Tourists on boardwalk over the mineral runoff from Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Crested Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

The Cathedral Group of Mount Teewinot, Mount Owen and Grand Teton from the Snake River at Schwabacher's Landing, Grand Teton National Park, Wyoming, United States of America, North America

Oklahoma City National Memorial and Museum, Oklahoma City, Oklahoma, United States of America, North America

River otter (Lutra canadensis), Yellowstone National Park, Wyoming, United States of America, North America

The Teton Range at first light after a fresh snow, Grand Teton National Park, Wyoming, United States of America, North America

Sand dunes, Great Sand Dunes National Park and Preserve, with Sangre Cristo Mountains in the background, Colorado, United States of America, North America

The Great Kiva, Aztec Ruins National Monument, UNESCO World Heritage Site, New Mexico, United States of America, North America

Five Faces Pictograph, Anthropomorph images 700 to 1000 years old, Davis Canyon, Canyonlands National Park, Utah, United States of America, North America

Salmon-coloured sandstone wall with evergreens, Grand Staircase-Escalante National Monument, Utah, United States of America, North America

Sandstone, hills at first light, Grand Staircase-Escalante National Monument, Utah, United States of America, North America

The northern part of the Roosevelt National Park, North Dakota, United States of America, North America

Chaco Culture National Historic Park, World Heritage Site, Hungo Pavi, UNESCO World Heritage Site, New Mexico, United States of America, North America

Sunrise at Mather Point, South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Red rock cliffs and badlands, Capitol Reef National Park, Utah, United States of America, North America