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Colorado chipmunk (Eutamias quadrivittatus), Rocky Mountain National Park, Colorado, United States of America, North America

Walkway through cold lava in the Craters of the Moon National Park, Idaho, 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

The colourful sandstone formations of the Bryce Canyon National Park in the late afternoon, Utah, United States of America, North America

The colourful sandstone formations of the Bryce Canyon National Park in the late afternoon, Utah, United States of America, North America

The colourful sandstone formations of the Bryce Canyon National Park in the late afternoon, Utah, United States of America, North America

Early morning sunlight shining on the towering cliffs of the Zion National Park, Utah, United States of America, North America

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

Half Dome viewed from Glacier Point, 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

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

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

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

Redrock sandstone formations in the Kodachrome Basin State Park, Utah, United States of America, North America

Walkway through cold lava in the Craters of the Moon National Park, Idaho, United States of America, North America

Walkway through cold lava in the Craters of the Moon National Park, Idaho, United States of America, North America

Travertine terraces in Mammoth hot springs terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Cathedral Rocks from Yosemite Valley, UNESCO World Heritage Site, California, United States of America, North America

View of Carmel Bay and rocky shoreline at Pebble Beach, 17 Mile Drive, Peninsula, Monterey, California, United States of America, North America

Lighthouse Field State Beach and Salt Rock, Santa Cruz, California, United States of America, North America

Cascades, American Basin, Uncompahgre National Forest, Colorado, United States of America, North America

Stone wall of the Window section, Arches National Park, Utah, United States of America, North America

The colourful sandstone formations of the Bryce Canyon National Park in the late afternoon, Utah, United States of America, North America

View of trail lights in Red Rock Canyon National Recreation Area, Las Vegas, Nevada, United States of America, North America

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

Sunset over Grand Canyon South Rim, UNESCO World Heritage Site, Arizona, United States of America, North America

Yosemite Falls, Yosemite National Park, UNESCO World Heritage Site, California, 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

Beautiful red sandstone formations in the Arches National Park, Utah, United States of America, North America

Kayaking and rafting down the Colorado River, Castle Valley, near Moab, Utah, United States of America, North America

View over the sandstone cliffs of the Grand Staircase Escalante National Monument, Utah, United States of America, North America

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

Rock formations, Needles District, Canyonlands National Park, Utah, United States of America, North America

View of beach and cliffs on Highway 1 near Davenport, California, United States of America, North America

Kivas and rooms, foreground rock fall destroyed part of pueblo, Pueblo Bonito 1000-1100 AD, Anasazi site, Chaco Canyon National Monument, New Mexico, United States of America (U.S.A.), North America

Part of the North Unit of Badlands National Park, carved out of the prairies by rapid water erosion of sediments, South Dakota, United States of America, North America

Spectacular coastline with waterfall, Julia Pfeiffer Burns State Park, Big Sur, California, United States of America, North America

Sedimentary rocks, clay, colour banded by iron oxides, horizontal Triassic Chinle Clay, Blue Mesa, Painted Desert, Arizona, United States of America, North America

Tourists on Top of the Rock viewing deck, Rockefeller Centre, Manhattan skyline, New York skyline, New York, United States of America, North America

John Ford's Point and the Three Sisters and cowboy on horse, Monument Valley, border of Arizona and Utah, United States of America, North America

Photographer with Mexican giant cardon (Pachycereus pringlei), Isla San Esteban, Baja California, Mexico, North America

Petroglyph National Monument, petroglyphs carved into volcanic rock by American Indians 400 to 700 years ago, New Mexico, United States of America, North America

View from the Alum Cave Bluffs trail in Great Smoky Mountains National Park, UNESCO World Heritage Site, Tennessee, United States of America (U.S.A.), North America

Indian petroglyphs drawn on red standstone by scratching away dark desert varnish of iron oxides, Newspaper Rock, Canyonlands, Utah, United States of America, North America

Matt Szundy, rock climbing teacher on the wall behind the Alyeska Resort, off Seward Highway, Girdwood, Alaska, United States of America, North America

Petroglyph National Monument, petroglyphs carved into volcanic rock by American Indians 400 to 700 years ago, New Mexico, United States of America, North America

Petroglyph National Monument, petroglyphs carved into volcanic rock by American Indians 400 to 700 years ago, New Mexico, United States of America, North America

Petroglyph National Monument, petroglyphs carved into volcanic rock by American Indians 400 to 700 years ago, New Mexico, United States of America, North America

Rock formation on the Nambe Chimayo road, Santa Fe, New Mexico, United States of America (U.S.A.), North America

Lake of the Clouds, Carlsbad Caverns National Park, UNESCO World Heritage Site, New Mexico, United States of America, North America

Matt Szundy, rock climbing teacher on the wall behind the Alyeska Resort, off Seward Highway, Girdwood, Alaska, United States of America, North America

Hoodoos, Bryce amphitheater, Bryce Canyon National Park, Utah, United States of America (U.S.A.), North America

Tourists on Top of the Rock viewing deck, Rockefeller Centre, Manhattan skyline, New York skyline, New York, United States of America, North America

Kilauea volcano crater showing solidified ropy lava called pahoehoe, The Big Island, Hawaii, Hawaiian Islands, United States of America, North America

Slot canyon in red sandstone, Antelope Canyon, near Page, Arizona, United States of America (U.S.A.), North America

The Snake River cutting through terrace 2000m below summits, Grand Teton National Park, Wyoming, USA, North America

Hot water in pools on calcite terraces deposited by Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Fisherman's Wharf, Monterey Bay, Peninsula, Monterey, Pacific Ocean, California, United States of America, North America