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A stone brick museum is dwarfed by giant sequoia trees at Mariposa Grove after fresh snowfall, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

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

Slump Block area in Theodore Roosevelt National Park North Unit, Watford, North Dakota, United States of America, North America

Desert Varnish on rocks, The Gorge, Capitol Reef National Park, Utah, United States of America, North America

Pronghorn (Antilocapra americana) buck, Yellowstone National Park, Wyoming, United States of America, North America

Bighorn sheep (Ovis canadensis) ram eating in the winter, Yellowstone National Park, Wyoming, United States of America, North America

Gray wolf (Canis lupus) 755M of the Lamar Canyon Pack running through the snow in the winter, Yellowstone National Park, Wyoming, United States of America, North America

Mesa Verde National Park, Spruce Tree House, UNESCO World Heritage Site, Colorado, United States of America, North America

Common raven (Corvus corax), Petrified Forest National Park, Arizona, United States of America, North America

Chaco Culture National Historic Park, World Heritage Site, Pueblo Bonito, kiva (foreground), UNESCO World Heritage Site, New Mexico, United States of America, North America

Chaco Culture National Historic Park, World Heritage Site, Pueblo Bonito, kiva (foreground), UNESCO World Heritage Site, New Mexico, United States of America, North America

Chaco Culture National Historic Park, World Heritage Site, Pueblo Bonito, kiva (foreground), UNESCO World Heritage Site, New Mexico, United States of America, North America

View from Cadillac Mountain, Acadia National Park, Mount Desert Island, Maine, New England, United States of America, North America

View from Cadillac Mountain, Acadia National Park, Mount Desert Island, Maine, New England, United States of America, North America

Grizzly bear (Ursus arctos horribilis) sow and yearling cub, Glacier National Park, Montana, United States of America, North America

Hoodoos, on the Queens Garden Trail, Bryce Canyon National Park, Utah, United States of America, North America

Blacktail prairie dog (Cynomys ludovicianus), Theodore Roosevelt National Park, North Dakota, United States of America, North America

Blacktail prairie dog (Cynomys ludovicianus), Theodore Roosevelt National Park, North Dakota, United States of America, North America

Bison (Bison bison) bull covered with snow in the winter, Yellowstone National Park, Wyoming, United States of America, North America

Black bear (Ursus americanus) sow and three cubs of the year, Yellowstone National Park, Wyoming, United States of America, North America

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

Aura Borealis (Northern lights) in Denali Wilderness National Park, Alaska, United States of America, North America

Yosemite Valley, with El Capitan and Bridal Veil Falls beneath a beautiful pink dawn sky, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Bison (Bison bison), Theodore Roosevelt National Park, North Dakota, United States of America, North America

Top of the Lower Falls from Lookout Point at sunrise, Grand Canyon of the Yellowstone, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Mesa Arch at sunrise, Canyonlands National Park, Utah, United States of America (U.S.A.), North America

Moss-covered tree trunks in the rainforest, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

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

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

View down Zion Canyon from trail to Angels Landing at dawn, Zion National Park, Utah, United States of America, North America

Cinnamon black bear (Ursus americanus) hangs on a chokeberry branch in autumn (fall), Grand Teton National Park, Wyoming, United States of America, North America

Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Black Canyon of the Gunnison National Park, Gunnison River deep in the canyon, Colorado, United States of America, North America

Black Bear (Ursus americanus) cub of the year climbing a tree, Yellowstone National Park, Wyoming, United States of America, North America

Unicorn Peak reflected in the snow melt pools on Tuolumne Meadows, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Second Beach, Olympic National Park, UNESCO World Heritage Site, Washington, United States of America, North America

Three bare trees on a hazy morning, Badlands National Park, South Dakota, United States of America, North America

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

Mesa Verde National Park, Cliff Palace, UNESCO World Heritage Site, Colorado, United States of America, North America

Chaco Culture National Historic Park, World Heritage Site, Pueblo Bonito, kiva (foreground), UNESCO World Heritage Site, New Mexico, United States of America, North America

Box elder (boxelder maple) (maple ash) (Acer negundo) branch with yellow leaves in the fall, Capitol Reef National Park, Utah, United States of America, North America

Female mountain bluebird (Sialia currucoides) with an insect, Yellowstone National Park, Wyoming, United States of America, North America

Acadia National Park, Mount Desert Island, Maine, New England, 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

Two girls with parasols in Burnt Forest, Yellowstone National Park, Wyoming, United States of America, North America

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

River Otter (Lutra canadensis) on frozen Yellowstone Lake, Yellowstone National Park, Wyoming, United States of America, North America

Fog mingling with evergreen trees, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Half Dome and the Merced River surrounded by fall foliage, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Giant Sequoia (Sequoiadendron giganteum) in a sunlit woodland, Mariposa Grove, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Granite domes of Yosemite reflected in the calm waters of Tenaya Lake, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Colourful sunrise above Yosemite Valley from Tunnel View, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Mount Moran in the winter with snow, Grand Teton National Park, Wyoming, United States of America, North America

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

Adult black-legged kittiwakes (Rissa tridactyla), South Marble Islands, Glacier Bay National Park, Alaska, United States of America, North America

Figure shows scale of the trunk of giant sequoia tree in the Giant Forest, Sequoia National Park, California, United States of America (U.S.A.), North America

Emerald Pool, Black Sand Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Valley View with El Capitan, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Eruption of Riverside Geyser seen from Firehole River bridge, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Rainbow cast by eruption of Riverside Geyser, Firehole River, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Dead tree trunks, Canary Spring, top Main Terrace, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Female tourist on boardwalk by the Morning Glory Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Sunset at Crater Lake with Wizard Island, Crater Lake National Park, Oregon, United States of America, North America

Alpine Shooting Star (Dodecatheon alpinum), Yellowstone National Park, Wyoming, United States of America, North America

Female Barrow's Goldeneye (Bucephala islandica), Yellowstone National Park, Wyoming, United States of America, North America

Mountain bluebird (Sialia currucoides) pair at their nest, Yellowstone 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

Chaco Culture National Historic Park, World Heritage Site, Pueblo Bonito, kiva (foreground), UNESCO World Heritage Site, New Mexico, United States of America, North America

Chaco Culture National Historic Park, World Heritage Site, Pueblo Bonito, kiva (foreground), UNESCO World Heritage Site, New Mexico, United States of America, North America

Chaco Culture National Historic Park, World Heritage Site, Pueblo Bonito, kiva (foreground), UNESCO World Heritage Site, New Mexico, United States of America, North America

Black bear (Ursus americanus) cub of the year or spring cub climbing a tree, Yellowstone National Park, Wyoming, United States of America, North America

Mount Hayden at dusk from Point Imperial, North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Female Williamson's sapsucker (Sphyrapicus thyroideus), Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grizzly bear (Ursus arctos horribilis), Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grizzly bear (Ursus arctos horribilis), Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bighorn sheep (Ovis canadensis) lamb, Yellowstone National Park, Wyoming, United States of America, North America

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

Vintage tour bus on the Sun Road, Glacier National Park, Montana, United States of America, North America

Barrow's Goldeneye (Bucephala islandica) swimming, Yellowstone National Park, Wyoming, United States of America, North America

Bison (Bison bison) cows grazing, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Three black bear (Ursus americanus) cubs of the year, Yellowstone National Park, Wyoming, United States of America, North America

Half Dome at sunset, the mountain partially obscurred by smoke from the 2014 Dog Rock wildfire, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Dead evergreen tree and sandstone mounds, Zion National Park, Utah, United States of America, North America

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

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