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Joshua Tree (Yucca brevifolia), Joshua Tree National Park, Mojave Desert, California, United States of America, North America

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

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

Giant petrified logs on the Purple Peninsula in Petrified Forest National Park, Arizona, United States of America, North America

Aerial panoramic view of the two peaks of Circeo's mountain at dusk, Circeo National Park, Latina province, Latium (Lazio), Italy, Europe

A view of the amphitheater from the rim at 10000 feet in Cedar Breaks National Monument, Utah, United States of America, North America

Watchman Mountain, Zion National Park, Colorado Plateau, Utah, United States of America, North America

An area south of the Tepees in Petrified Forest National Park known as the Little Tepees, Arizona, United States of America, North America

An area south of the Tepees in Petrified Forest National Park known as the Little Tepees, Arizona, United States of America, North America

Hornisgrindeturm Tower on Hornisgrinde mountain , Black Forest National Park, Baden-Wurttemberg, Germany, Europe

A view of the upper Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Night photography at Blacktail Canyon, just before river mile 121, Grand Canyon National Park, Arizona, United States of America, North America

An adult desert collared lizard (Crotaphytus bicinctores), basking in Grand Canyon National Park, Arizona, United States of America, North America

Flight seeing from Haines over the Fair-weather Range in Glacier Bay National Park, Southeast Alaska, USA.

A view of Margerie Glacier in the Fair-weather Range, Glacier Bay National Park, Southeast Alaska, USA.

Tall trees covered with snow in the frozen arctic forest at dawn, Riisitunturi National Park, Posio, Lapland, Finland

Half Dome granite rock formation, Yosemite National Park, Sierra Nevada, Central California, California, USA

Scenic view of desert of Death Valley National Park during sunset, Eastern California, California, USA

Lava stones and Pectol's Pyramid at dusk, Capitol Reef National Park, Utah, Western United States, USA

View of the salty bentonite hills on the north side of the Blue Forest in Petrified Forest National Park Arizona.

An area of the Red Basin in Petrified Forest National Park Arizona where the purple bentonite transitions into red for which the basin is named.

A pair of hoodoo formations near the Red Basin in Petrified Forest National Park Arizona called the Red Basin Gnomes.

The snowy cliffs of Desert View Point on the left with the Palisades on the right at Grand Canyon National Park Arizona.

The Smithsonian Institution National Museum of the American Indian on the National Mall in Washington, D.C.

Caves in the cliff walls, used to store food by ancient Anasazi Indians, Canyon De Chelly National Monument, Arizona, United States of America, North America

Panorama view of the Junction between the north and south forks of Canyon De Chelly National Monument, with Dog Rock rock formation on the far left, Arizona, United States of America, North America

The Owachomo Bridge (Rock Mound in Hopi), Natural Bridges National Monument, Utah, United States of America, North America

The Owachomo Bridge (Rock Mound in Hopi), Natural Bridges National Monument, Utah, United States of America, North America

California sea lions (Zalophus californianus), hauled out in Monterey Bay National Marine Sanctuary, California, United States of America, North America

View of sunset from Wadshelf in the Peak District National Park, Derbyshire, England, United Kingdom, Europe

Aerial view of Baslow village, Peak District National Park, Derbyshire, England, United Kingdom, Europe

Mirror Lake in the Tenaya Canyon, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

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

Grand Canyon viewed through a rock cave below Lipan Point on the South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Balanced Rock at dusk, with snow, Arches National Park, Utah, United States of America, North America

A mountain biker in Titus Canyon in Death Valley National Park, California, United States of America, North America

The Racetrack, a playa or dried up lakebed, in Death Valley National Park, California, United States of America, North America

The Hanging Cliffs rock formation at the Blue Mountains National Park, UNESCO World Heritage Site, New South Wales, Australia, Pacific

The Hanging Cliffs rock formation at the Blue Mountains National Park, UNESCO World Heritage Site, New South Wales, Australia, Pacific

Marshland on the high rugged moors of Dartmoor National Park in evening sunlight, Gidleigh Common, near Chagford, Devon, England, United Kingdom, Europe

Schwarbacher's Landing, Grand Teton National Park, Wyoming, United States of America (U.S.A.), North America

Elephant, Loxodonta africana, close to Addo Elephant National Park, Eastern Cape, South Africa, Africa

Swinging Bridge over Merced River, Cathedral Beach, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Grand Geyser erupts, forcing steam high into the air, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Castle Geyser and steamy surrounds, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Cascade Canyon in autumn (fall), Grand Teton National Park, Wyoming, United States of America, North America

A view from the lower trail, Iguazu Falls National Park, UNESCO World Heritage Site, Misiones, Argentina, South America

Zion Canyon View from Zion Park Boulevard, Zion National Park, Utah, United States of America, North America

Hoodoos, pine trees and snow lit by strong late afternoon sun in winter, near Sunrise Point, Bryce Canyon National Park, Utah, United States of America, North America

Rim cliffs and hoodoos lit by late afternoon sun in winter, Paria View, Bryce Canyon National Park, Utah, United States of America, North America

Rocks lit by late afternoon sun with distant view in winter, Paria View, Bryce Canyon National Park, Utah, United States of America, North America

Late afternoon sun lights lines of hoodoos at Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America

Late afternoon sun lights hoodoos and cliffs with a cloudy sky in winter, near Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America

Bison (Bison bison) in a snowstorm, Yellowstone National Park, Wyoming, United States of America, North America

Sand dune with frost at dawn, Great Sand Dunes National Park and Preserve, Colorado, United States of America, North America

The Needles in Chesler Park, Canyonlands National Park, Utah, United States of America, North America

Crowned plover or crowned lapwing (Vanellus coronatus), Addo Elephant National Park, South Africa, Africa

Female, saddle-billed Stork (Ephippiorhynchus senegalensis), Masai Mara National Reserve, Kenya, East Africa, Africa

Wooden statues on the royal grounds in Puuhonua o Honaunau National Historical Park, Big Island, Hawaii, United States of America, Pacific

Kilauea Point National Wildlife Refuge on the island of Kauai, Hawaii, United States of America, Pacific

Hippopotamus (Hippopotamus amphibius) mother with baby, Murchison Falls National Park, Uganda, East Africa, Africa

Yellow flowers and green meadows frame the church of Oga, Bormio, Stelvio National Park, Upper Valtellina, Lombardy, Italy, Europe

Two Richardson ground squirrel (Citellus richardsoni), Grand Teton National Park, Wyoming, United States of America, North America