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Red canyon in the background of a little creek, Devils Tower National Monument, Wyoming, United States of America, North America

Hovenweep Castle, Square Tower Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America

Yosemite Falls in full flow during spring in Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Sandstone hill at dusk, Grand Staircase-Escalante National Monument, Utah, 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

Gay Street Bridge and Tennessee River, Knoxville, Tennessee, United States of America, North America

Richardson Ground Squirrel (Citellus richardsoni) eating, Camp Hale, White River National Forest, Colorado, United States of America, North America

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

Aerial view of Boston from the Prudential Sky Walk, Boston, Massachusetts, New England, United States of America, North America

Siltstone eroded formations of Zabriske Point, Furnace Creek, Death Valley National Park, California, United States of America, North America

Dawn with low mist over the sandstone hoodoos in Bryce Amphitheater, Inspiration Point, Bryce Canyon National Park, Utah, United States of America, North America

Clouds and mountains and tundra in the fall, Katmai Peninsula, Alaska, United States of America, North America

Aspen leaf turning red and orange, Uncompahgre National Forest, Colorado, United States of America, North America

Hoodoo rock formation in La Jolla, San Diego County, California, United States of America, North America

American pipit (Anthus rubescens rubescens), San Jacinto Wildlife Area, California, United States of America, North America

Panoramic photo of view in late evening from Cape Royal, North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Sunrise over Totem Pole, Monument Valley Navajo Tribal Park, Utah, United States of America, North America

Traffic crossing Wells Street Bridge over the Chicago River, Chicago, Illinois, United States of America, North America

Yellow cryptanth (Brenda's yellow catseye) (Brenda's yellow cryptantha) (Plateau yellow catseye) (Cryptantha flava), Canyon Country, Utah, United States of America, North America

Alpine shooting star (Dodecatheon alpinum), Yellowstone National Park, Wyoming, United States of America, North America

White Mountains National Forest, New Hampshire, New England, United States of America, North America

Tour boat passing under a raised disused railway bridge on the Chicago River, Downtown towers in the background, Chicago, Illinois, United States of America, North America

Cincinnati Museum Center at Union Terminal, Cincinnati, Ohio, United States of America, North America

Panoramic photo of sunrise from Inspiration Point, Bryce Canyon National Park, Utah, United States of America, North America

View early morning from Ponderosa Point, Bryce Canyon 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

High angle view of South Wabash Avenue, The Loop, Chicago, Illinois, United States of America, North America

Chaco ruins in the Chaco Culture National Historic Park, UNESCO World Heritage Site, New Mexico, United States of America, North America

Outlook for the pinnacles in the beautiful rock formations of Bryce Canyon National Park, Utah, United States of America, North America

Bison in the Lamar Valley, 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

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

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

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

Blue Funnel spring, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Lone hiker in Turret Arch, Arches National Park, near Moab, Utah, United States of America, North America

View over Paradise Valley from the slopes of Camelback Mountain, Phoenix, Arizona, United States of America (U.S.A.), North America

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

Black bear (Ursus americanus) coming down from a tree, Yellowstone National Park, Wyoming, United States of America, North America

Bison (Bison bison) bull among yellow wildflowers, Yellowstone National Park, Wyoming, United States of America, North America

Bison (Bison bison) calf in front of its mother, Yellowstone National Park, Wyoming, United States of America, North America

Hazleton Mountain in the winter, San Juan Mountains, Colorado, United States of America, North America

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

The Golden Gate Bridge at sunrise, San Francisco, California, United States of America, North America