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

South Kaibab Trailhead overlook, South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

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

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

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

The Olgas (Kata Tjuta), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

The Olgas (Kata Tjuta), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Limestone stalactites and stalagmites in Ballic Cave, near Tokat, Central Anatolia, Turkey, Asia Minor, Eurasia

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

Rock formation in the Eduardo Avaroa Andean Fauna National Reserve, Southwest Highlands, Bolivia, South America

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

Caldeira and Bromo at 2329 m, and Semeru at 3676m, volcanoes on Java, Indonesia, Southeast Asia, Asia

Clouds over Palisades at sunset, Uncompahgre National Forest, Colorado, United States of America, North America

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

Tourists visting the disused salt pans at Pedra De Lume, Pedra di Lumi, Sal Island, Cape Verde, Atlantic, Africa

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

Hot pools and steam from Strokkur Geysir at sunrise, winter, at geothermal area beside the Hvita River, Geysir, Iceland, Polar Regions

Red sand granite beach, unusual geology, coastal views, Reawick, West Mainland, Shetland Isles, Scotland, United Kingdom, Europe

Beautiful rock formation, Pancake Rocks, Paparoa National Park, West Coast, South Island, New Zealand, Pacific

The colourful multi hued Champagne Pool, Wai-O-Tapu Thermal Wonderland, Waiotapu, North Island, New Zealand, Pacific

Rock formations in the Tinajani Canyon in the Andes, photographer in foreground, Peru, South America

Volcanic boulders on Navajo sandstone, Grand Staircase-Escalante National Monument, Utah, United States of America, North America

Limestone pavements above Southerscales Scars, Ingleborough, Yorkshire Dales, Yorkshire, England, United Kingdom, Europe

Belstone Tor and Irishman's Wall on a snowy winter morning, Dartmoor, Devon, England, United Kingdom, Europe

Tourists in sand dunes at Death Valley (Valle de la Muerte), San Pedro de Atacama, Atacama Desert, North Chile, Chile, South America

Symphony of Stones basalt columns, UNESCO World Heritage Site, Garni, Kotayk Province, Armenia, Caucasus, Central Asia, Asia

Death Valley (Valle de la Muerte), with San Pedro de Atacama behind, Atacama Desert, North Chile, Chile, South America

Fairy Chimneys rock formation landscape near Goreme, Cappadocia, Anatolia, Turkey, Asia Minor, Eurasia

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

Yellow and salmon sandstone forms, Coyote Buttes Wilderness, Vermillion Cliffs National Monument, Arizona, United States of America, North America

Pine tree growing on a sandstone ledge, Zion National Park, Utah, United States of America, North America

Artemesia Geyser Pool, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, 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

Tufa spires and tower formations of calcium carbonate at sunset, Mono Lake, South Tufa Reserve, Mono Basin Scenic Area, Lee Vining, Inyo National Forest Scenic Area, California, United States of America, North America

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

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

Colorado River from Dead Horse Point Overlook, Dead Horse Point State Park, Utah, United States of America, North America

Abyss Pool, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

Toadstool Paria Rimrocks at sunset, near Kanab, Grand Staircase-Escalante National Monument, Utah, United States of America, North America

The natural show of Frasassi Caves with sharp stalactites and stalagmites, Genga, Province of Ancona, Marche, Italy, Europe

Boggle Hole and Robin Hood's Bay on a sunny winter's day, Yorkshire, England, United Kingdom, Europe

Couple taking photos on Salar de Uyuni (Salt Flats of Uyuni), Potosi Department, Bolivia, South America

Granite boulders in the Devil's Marbles Conservation Reserve, Northern Territory, Australia, Pacific

The Olgas (Kata Tjuta), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

The Olgas (Kata Tjuta), Uluru-Kata Tjuta National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

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

A 4x4 on Salar de Uyuni, the largest salt flat in the world, South West Bolivia, Bolivia, South America

A 4x4 on Salar de Uyuni, the largest salt flat in the world, South West Bolivia, Bolivia, South America

Arbol de Piedra (stone tree), wind eroded rock near Laguna Colorada, Southwest Highlands, Bolivia, South America

Wavy orange and white sandstone at sunrise, Valley Of Fire State Park, Nevada, United States of America, North America

Caldeira and Bromo at 2329 m, and Semeru at 3676 m, volcanoes on Java, Indonesia, Southeast Asia, Asia

Osorno Volcano seen from Todos Los Santos Lake, Vicente Perez Rosales National Park, Chilean Lake District, Chile, South America