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Liberty Cap, a dormant hot spring cone, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Jagged ridge with puffy clouds, Rio Grande National Forest, Colorado, United States of America, North America

Cascades in Minnie Gulch, San Juan National Forest, Colorado, United States of America, North America

Cascades in Minnie Gulch, San Juan National Forest, Colorado, United States of America, North America

Canoeing across Bowman Lake, Glacier National Park, Montana, United States of America, North America

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

Half Dome and Clouds Rest mountains from Olmsted Point, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Mount Wilson in the winter, Uncompahgre National Forest, Colorado, United States of America, North America

Female Williamson's sapsucker (Sphyrapicus thyroideus) on a feeding tree, Yellowstone National Park, Wyoming, United States of America, North America

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

Fog among the mountains and evergreens, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Sunset illuminates the rugged mountainous outcrops of Grand Staircase-Escalante National Monument, Arizona, United States of America, North America

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

El Capitan reflected in a flood pool, Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Shores of the Virgin River and winter trees, Pa'rus Trail, Zion National Park, Utah, United States of America, North America

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

Pink sunset sky above Tuolumne Meadows, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

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

Marymere Falls, Olympic National Park, UNESCO World Heritage Site, Washington, United States of America, North America

Everglades National Park, UNESCO World Heritage Site, Florida, United States of America, North America

Carpenters' Hall, Independence National Historical Park, Old City District, Philadelphia, Pennsylvania, United States of America, North America

Spotted Sandpiper (Actitis macularia), Yellowstone National Park, Wyoming, United States of America, North America

Fort Union National Monument and Santa Fe National Historic Trail, New Mexico, United States of America, North America

Saguaro cacti, Saguaro National Park, Tuscon Mountain District west unit, Tucson, Arizona, United States of America, North America

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

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

Northern (Steller) sea lions (Eumetopias jubatus), South Marble Island, Glacier Bay National Park, Southeastern Alaska, United States of America, North America

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

Aerial photo of Colorado River and the Grand Canyon from Papillon Helicopter, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Mountain layers at sunset, Manti-La Sal National Forest, Utah, United States of America, North America

Checkerboard Mesa, formed of Navajo sandstone, Zion National Park, Utah, United States of America, North America

Hickman Bridge Trail, Navajo Dome, Capitol Reef National Park, Utah, United States of America, North America

Thor's Hammer in early morning from Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America

Beautiful rock formations in the Needles, Canyonlands National Park, Utah, 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

Lower Falls from Artists Point, Grand Canyon of the Yellowstone River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

View of Lower Falls from Red Rock Point, Grand Canyon of the Yellowstone River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

Clouds over the San Juan Mountains, San Juan National Forest, Colorado, United States of America, North America

Mount Grinnell and Swiftcurrent Lake at dawn, 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

Pine tree on the exposed granite rock at Sentinel Dome, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

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

The Three Brothers reflected in the River Merced, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Guadalupe Peak and El Capitan at dusk, Guadalupe Mountains National Park, Texas, United States of America, North America

Greater roadrunner (Geococcyx californianus) in captivity, Living Desert Zoo And Gardens State Park, New Mexico, United States of America, North America

Sandhill crane (Grus canadensis), Yellowstone National Park, Wyoming, United States of America, North America

Coyote (Canis latrans) on the snow in the spring, Yellowstone National Park, 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

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

Three black bear (Ursus americanus) cubs of the year or spring cubs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Aspens in the fall in fog, Grand Mesa National Forest, Colorado, United States of America, North America

Yosemite Valley, with evening light bathing Half Dome and El Capitan, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

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

Yosemite Valley and Bridalveil Fall from Tunnel View, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Evening sun shining through trees in spring, Muir Woods National Monument, California, United States of America, North America

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

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

Reflection of the Teton range, Bradley Lake, Grand Teton National Park, Wyoming, United States of America, North America

Mesquite Sand Dunes at dawn, Death Valley National Park, California, United States of America, North America

Castle Geyser at sunset, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Theodore Roosevelt National Park North Unit, Watford, North Dakota, 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

Pu'ukohola Heiau National Historic Site, Big Island, Hawaii, United States of America, North America

Memorial to General George Custer at the Little Bighorn Battlefiled National Monument, Montana, United States of America, North America

Pueblo Bonito Chaco Culture National Historical Park scenery, New Mexico, United States of America, North America

Badlands at first light, Badlands National Park, South Dakota, United States of America, North America

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

Sandstone, formations, Vermillion Cliffs National Monument, Arizona, United States of America, North America

Tetons at dawn in the winter, Grand Teton National Park, Wyoming, United States of America, North America

Northern (Steller) sea lions (Eumetopias jubatus), South Marble Island, Glacier Bay National Park, Southeastern Alaska, United States of America, North America

Pit House, Step House Ruin, dates from 626AD to 1226AD, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, United States of America, North America

Badlands with maroon color, Capitol Reef National Park, Utah, United States of America, North America

Petroglyphs near Una Vida, Chaco Culture National Historical Park, UNESCO World Heritage Site, New Mexico, 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

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

Brink of Lower Falls of Yellowstone River, Grand Canyon of the Yellowstone, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America