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Cycling, 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

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

Mesquite flat sand dunes in Death Valley National Park, California, United States of America, North America

Grand Canyon view with a rock window beneath a cliff on the right, located west of Pinal Point on the south rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Young brown bear (Ursus arctos), feeding at low tide in Geographic Harbor, Katmai National Park, Alaska, United States of America, North America

View of the Deadhorse Creek Trail, Mount Rainier National Park, Washington State, United States of America, North America

Views of the Nisqually Glacier retreat from the Skyline Trail, Mount Rainier National Park, Washington State, United States of America, North America

Meltwater lake on Mount Rainier from the Burroughs Mountain Trail, Mount Rainier National Park, Washington State, United States of America, North America

Meltwater lake on Mount Rainier from the Burroughs Mountain Trail, Mount Rainier National Park, Washington State, United States of America, North America

Views of the Nisqually Glacier from the Skyline Trail, Mount Rainier National Park, Washington State, United States of America, North America

Ancestral Puebloan ruin at Desert View on the Colorado River, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon northwest view from a rock island just beyond the tourist overlook of Lipan Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Tourists standing in front of the Aialik Glacier, coming off the Harding Ice Field, Kenai Fjords National Park, Alaska, United States of America, North America

A deep dropoff at Grand Canyon called Loki's Abyss east of Thor's Hammer Overlook, with Loki's Rock just right of center, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

A rock spire separate from the cliff wall west of Zuni Point at Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

An adult Uinta chipmunk (Neotamias umbrinus), in Bryce Canyon National Park, Utah, United States of America, North America

An adult golden-mantled ground squirrel (Callospermophilus lateralis), in Bryce Canyon National Park, Utah, United States of America, North America

A waterfall running through the Mossy Cave Trail in Bryce Canyon National Park, Utah, United States of America, North America

Inside the Big Room at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

Sequoia trees in the Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Various hoodoos in Angels Garden at Petrified Forest National Park, Arizona, United States of America, North America

Abandoned Train Depot in Rhyolite, a ghost town in Nye County, near Death Valley National Park, Nevada, United States of America, North America

Lone observer watches Grand Geyser erupt, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Rock and pine trees lit by early morning sun in winter, Queen's Garden Connecting Trail, Bryce Canyon National Park, Utah, United States of America, North America

Hoodoos, rim and snow lit by dawn light in winter, Queen's Garden Trail at Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Hoodoos and snow lit by strong dawn light in winter, Queen's Garden Trail at Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Fresh snow fall, Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Sunrise over Yellowstone Lake with reflection, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

Smoking Kilauea Summit Lava Lake in the Hawaii Volcanoes National Park, UNESCO World Heritage Site, Big Island, Hawaii, United States of America, Pacific

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

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

Brown Bear (Ursus arctos horribilis) in Moraine Creek, Katmai National Park and Preserve, Alaska, United States of America, North America

Osprey (Pandion haliaetus) fledglings on nest, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Elk herd (Cervus canadensis) grazing in Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Adult desert bighorn sheep (Ovis canadensis), Zion National Park, Utah, United States of America, North America

Hoodoo rock formations in Bryce Canyon Amphitheater, Bryce Canyon National Park, Utah, United States of America, North America

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

A view of Spire Cove in Resurrection Bay in Kenai Fjords National Park, Alaska, 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

Panorama of Teton Range at first light, Grand Teton National Park, Wyoming, United States of America, North America

View of hoodoo formations from the Fairyland Trail in Bryce Canyon National Park, Utah, United States of America, North America

Vertical of bull moose (Alces alces) in front of Teton Range, Grand Teton National Park, Wyoming, United States of America, North America

Snowscape of winding river and trees, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Coronado Butte at Grand Canyon viewed from the end of Coronado Ridge, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Columbian ground squirrel (Citellus columbianus), Glacier National Park, Montana, United States of America, North America

Juvenile gray-crowned rosy-finch (Leucosticte tephrocotis), Glacier National Park, Montana, United States of America, North America

Turret Arch through North Window at dawn, Arches National Park, Utah, United States of America, North America

View of the valley floor from Angel's Landing Trail in Zion National Park, Utah, United States of America, North America

Kiva and other structures at Pueblo Bonito, Chaco Culture National Historic Park, UNESCO World Heritage Site, New Mexico, United States of America, North America

Backlit sandstone hoodoos in Bryce Amphitheater, Bryce Canyon National Park, Utah, United States of America, North America

Lone tree in snow dune, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

A moving rock at the Racetrack, a playa or dried up lakebed, in Death Valley National Park, California, United States of America, North America

View of Delicate Arch through Frame Arch with sunburst, Arches National Park, Utah, United States of America, North America

Narada Falls, Mount Rainier National Park, Washington State, United States of America, North America

Reflection Lake, Mount Rainier National Park, Washington State, United States of America, North America

House Valley, with the Vermilion Cliffs in the distance, viewed from the summit of Saddle Mountain on the north edge of Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand Canyon viewed from the cliffs of Walhalla Glades on the North Rim, with Cape Royal on left, Vishnu Temple in the center, and Wotan's Throne on right, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Bald Eagle (Haliaeetus leucocephalus) flying, Yellowstone National Park, Wyoming, United States of America, North America

Full moon over Fiery Furnace, a maze like passageway, Arches National Park, Utah, 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 Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

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

Dramatic sea stacks on Rialto Beach in the Olympic National Park, UNESCO World Heritage Site, Pacific Northwest coast, Washington State, United States of America, North America

Mount Redoubt, Lake Clark National Park and Preserve, Alaska, United States of America, North America

A view of the Aialik Glacier, coming off the Harding Ice Field, Kenai Fjords National Park, Alaska, United States of America, North America

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

An adult tufted puffin (Fratercula cirrhata) roosting on a cliff in Kenai Fjords National Park, Alaska, United States of America, North America

Schwabacher landing, Teton Range, Grand Teton National Park, Wyoming, United States of America, North America

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

A view of the Exit Glacier, coming off the Harding Ice Field, Kenai Fjords National Park, Alaska, United States of America, North America

A view of Spire Cove in Resurrection Bay in Kenai Fjords National Park, Alaska, United States of America, North America

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

Grand Canyon viewed from the Bright Angel Trail in winter just past the 1.5 Mile Rest House after sunrise, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Old pilings in Resurrection Bay, gateway to the Kenai Fjords in Kenai Fjords National Park, Alaska, United States of America, North America

Shooting the rapids in a raft on the Colorado River, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

A ridge in the Devil's Playground of crumbling hoodoos that resemble Goblins, Petrified Forest National Park, Arizona, United States of America, North America

Panorama of a ridge in the Devil's Playground of crumbling hoodoos, Petrified Forest National Park, Arizona, United States of America, North America

Grandview Point viewed from the port bow of the formation called Sinking Ship, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America