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Steaming volcanic mud pools, Rincon de la Vieja National Park at foot of Rincon Volcano, Gaunacaste, Costa Rica

Walls of China, a series of Lunettes in the Mungo National Park, part of the Willandra Lakes Region, UNESCO World Heritage Site, Victoria, Australia, Pacific

Ocotillo cactus (Fouquieria Splendens) in foreground, Saguaro cactus (Camegiea Gigantea) in background, West-Tucson Mountain District, Saguaro National Park, Arizona, United States of America, North America

Cactus and sandstone formations at dawn, Valley Of Fire State Park, Nevada, United States of America, North America

Buildings in the abandoned former German diamond mining town of Kolmanskop on the edge of the Namib Desert, Forbidden Diamond Area near Luderitz, Namibia

Aerial view from hot air balloon over magnificent desert landscape covered in 'Fairy Circles', Namib Rand game reserve Namib Naukluft Park, Namibia, Africa

The orange sand and snaking ridge of Elim Dune against blue sky, Namib Desert near Sesriem, Namib Naukluft Park, Namibia, Africa

Camel silhouetted below the moon at night, Erg Chebbi Desert, Sahara Desert near Merzouga, Morocco, North Africa, Africa

Kasha-Katuwe Tent Rock National Monument, ladder leading to ancient cave dwelling, New Mexico, United States of America, North America

Kasha-Katuwe Tent Rock National Monument, tent like rock formations, from volcanic eruptions 6 to 7 million years ago, New Mexico, United States of America, North America

Canyon de Chelly National Monument, Canyon del Muerto in Fall Colors, Arizona, United States of America, North America

Canyon de Chelly National Monument, View from the Whitehouse Overlook, Arizona, United States of America

Rippled gypsum, sand dunes in the White Sands National Monument, New Mexico, United States of America, North America

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

Rock formations, Chesler Park, The Needles district, Canyonlands National Park, Utah, United States of America, North America

Desert View Watchtower, Grand Canyon National Park, UNESCO World Heritage Site, Northern Arizona, United States of America, North America

Sharyn Canyon National Park and the Valley of Castles, Tien Shan Mountains, Kazakhstan, Central Asia, Asia

Woman drawing a heart in the sand, Sand Dunes Point, Death Valley National Park, California, United States of America, North America

The Byzantine Church of St. Nilus in Mamshit, an ancient Nabatean city in the Negev, Israel, Middle East

Snaking line in the earth, Dead Vlei, Sossusvlei, Namib-Naukluft Park, Namib Desert, Namibia, Africa

A Tuareg dressed for celebrations at the entrance of the Dar Sahara tented camp in the Fezzan desert, Libya, North Africa, Africa

Small bush in the wash near a sandstone butte, Capitol Reef National Park, Utah, United States of America, North America

Kasha-Katuwe Tent Rock National Monument, 14th and 15th century dwellings, New Mexico, United States of America, North America

Window Rock Navajo Tribal Park & Veteran's Memorial, Window Rock, Arizona, United States of America, North America

Wilson Arch, spans 91 feet with a height of 42 feet, near Moab, Utah, United States of America, North America

Kasha-Katuwe Tent Rock National Monument, tent like rock formations, from volcanic eruptions 6 to 7 million years ago, New Mexico, United States of America, North America

Natural Bridges National Monument, view from Horsecollar Ruin Overlook Trail, Utah, United States of America, North America

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

Tourists at Mather Point overlook, South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Grand View Point overlook and juniper tree, Island in the Sky, Canyonlands National Park, Utah, United States of America, North America

West Mitten Butte, East Mitten Butte and Merrick Butte, The Mittens, Monument Valley Navajo Tribal Park, Arizona, United States of America, North America

Orange and white sandstone layers with colorful clouds at sunrise, Valley Of Fire State Park, Nevada, United States of America, North America

Sandstone formations in the Cathedral Gorge State Park, Nevada, United States of America, North America

Iglesia San Pedro, colonial adobe walled church dating from the 17th century, San Pedro de Atacama, Atacama Desert, Norte Grande, Chile, South America

Jumping cholla (Cylindropuntia fulgida) (hanging chain cholla) native to the southwestern United States of America and northern Mexico, Baja, Mexico, North America

Walls of China, a series of Lunettes in the Mungo National Park, part of the Willandra Lakes Region, UNESCO World Heritage Site, Victoria, Australia, Pacific

Saguaro Cactus (Camegiea Gigantea), West-Tucson Mountain District, Saguaro National Park, Arizona, United States of America, North America

Brilliant orange clouds at sunrise over sandstone, Valley Of Fire State Park, Nevada, United States of America, North America

Side view of Dune 45 showing sand blowing in the wind and the sunlit ridge against blue sky, Namib Desert near Sesriem, Namib Naukluft Park, Namibia, Africa

Interior of building slowly being consumed by the sands of the Namib Desert in the abandoned former German diamond mining town of Kolmanskop, Forbidden Diamond Area near Luderitz, Namibia, Africa

Dried mud pan with ancient camelthorn trees and orange sand dunes in the distance, Dead Vlei, Namib Desert, Namib Naukluft Park, Namibia, Africa

Dead camelthorn trees said to be centuries old against the towering orange sand dunes of the Namib Desert at Dead Vlei, Namib Desert, Namib Naukluft Park, Namibia, Africa

Cycling in the Devil's ravine (Quebrada Del Diablo), part of the Katarpe Valley, San Pedro de Atacama, Atacama Desert, North Chile, Chile, South America

Kasha-Katuwe Tent Rock National Monument, ladder leading to ancient cave dwelling, New Mexico, United States of America, North America

Canyon de Chelly National Monument, Mummy Cave Ruins, Arizona, United States of America, North America

Canyon de Chelly National Monument, View from the Whitehouse Overlook, Arizona, United States of America

West Mitten Butte and East Mitten Butte, The Mittens at sunrise, Monument Valley Navajo Tribal Park, Arizona, United States of America, North America

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

Sitting Hen Butte and Rooster Butte at sunset, Valley of the Gods, Utah, United States of America, North America

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