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Shoreline view of the historic Bainbridge Steel Dam near Ash Fork, Kaibab National Forest, Arizona, United States of America

The 7th switchback along the North Kaibab Trail at Grand Canyon North Rim, UNESCO, Arizona, United States of America

Road through the sandstone rock formations in the desert canyons of the Ashar Valley, Medina Province, Saudi Arabia

Remarkable sandstone rock carved by erosion in the Ashar Valley, AlUla, Medina Province, Saudi Arabia

Cliffs viewed from Dun Aengus, prehistoric hill fort, Inishmore, largest of the Aran Islands, Galway Bay, County Galway, Connacht, Republic of Ireland

The colourful hills of the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America

Multicoloured strata hill in the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America

Cliff Geyser erupting in the Black Sand Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

White travertine basins at sunset, Pamukkale, UNESCO World Heritage Site, Anatolia, Turkey, Asia Minor, Eurasia

Multicoloured strata in the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America

The colourful hills of the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America

Mighty John Day River flowing through the Sheep Rock unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America

Multicoloured strata hill in the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America

The Giants Causeway, UNESCO World Heritage Site, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe

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

Multicoloured strata hill in the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America

The Giants Causeway, UNESCO World Heritage Site, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe

Multicoloured strata in the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America

The Giants Causeway, UNESCO World Heritage Site, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe

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

Multicoloured strata in the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America

The Giants Causeway, UNESCO World Heritage Site, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe

Multicoloured strata hill in the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, 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

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

The Giants Causeway, UNESCO World Heritage Site, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe

View over the canyonlands and the Colorado River from the Dead Horse State Park, Utah, United States of America, North America

View over the canyonlands and the Colorado River from the Dead Horse State Park, Utah, United States of America, North America

Road leading through the Sheep Rock unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America

The Giants Causeway, UNESCO World Heritage Site, County Antrim, Ulster, Northern Ireland, United Kingdom, Europe

Road leading through the Grand Staircase Escalante National Monument, 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

Road leading through the Grand Staircase Escalante National Monument, Utah, United States of America, North America

View over the canyonlands and the Colorado River from the Dead Horse State Park, Utah, United States of America, North America

The colourful hills of the Painted Hills unit in the John Day Fossil Beds National Monument, Oregon, United States of America, North America

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

View over the canyonlands and the Colorado River from the Dead Horse State Park, Utah, United States of America, North America

The Upper Falls in the Grand Canyon of Yellowstone in the Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

The Upper Falls in the Grand Canyon of Yellowstone in the Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Sandstone chimneys in the Kodachrome Basin State Park, 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

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

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

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

Road leading through the Grand Staircase Escalante National Monument, 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

Illuminating stalactites reflecting in the turquoise waters of martel lake create a breathtaking subterranean spectacle in drach caves

Tourist walking on a concrete walkway inside the famous postojna cave in slovenia, admiring the stalactites and stalagmites during a guided tour

Tourists walking on a footpath and exploring the magnificent postojna cave in slovenia, a popular tourist attraction

Tourists walking on illuminated footpath inside the famous postojna cave, a karst cave system near postojna, slovenia

Delicate Arch, rock arch, La Sal Mountains, Arches National Park, Moab, Utah, Southwestern United States, United States of America, USA

Champagne Pool, hot spring, Waiotapu Geothermal Wonderland, Rotorua, North Island, New Zealand, Oceania

Champagne Pool, hot spring, Waiotapu Geothermal Wonderland, Rotorua, North Island, New Zealand, Oceania

View of Bryce Amphitheater from Inspiration Point, coloured rock formations, fairy chimneys, morning light, Bryce Canyon National Park, Utah, USA, North America

Champagne Pool, hot spring, Waiotapu Geothermal Wonderland, Rotorua, North Island, New Zealand, Oceania

Moeraki boulders, at sunrise, geological formation, Koekohe Beach, Moeraki, East Coast, Otago, South Island, New Zealand, Oceania

Delicate Arch, rock arch, La Sal Mountains, Arches National Park, Moab, Utah, Southwestern United States, United States of America, USA

Champagne Pool, hot spring, Waiotapu Geothermal Wonderland, Rotorua, North Island, New Zealand, Oceania

Delicate Arch, rock arch, La Sal Mountains, Arches National Park, Moab, Utah, Southwestern United States, United States of America, USA

Tourists taking pictures in front of Delicate Arch, rock arch, La Sal Mountains, Arches National Park, Moab, Utah, Southwestern United States, United States of America, USA

Delicate Arch, rock arch, La Sal Mountains, Arches National Park, Moab, Utah, Southwestern United States, United States of America, USA

Moonscape Overlook overlooks Utah's Blue Valley. It is called this due to the lunar appearance of the valley, Hanksville, Utah, United States of America

Hoodoos of Valley of Dreams take on fantastical shapes after eons of erosion from wind and rain. This hoodoo is named Alien Throne, with a beautiful sunset sky, Albuquerque, New Mexico, United States of America

Storm clouds gather over Shiprock, New Mexico. The rising suns illuminates this sacred rock of Navajo people, Shiprock, New Mexico, United States of America

Karst rock formations and fog in Ao Phang Nga National Park in Thailand, Ao Phang Nga, Phang-nga, Thailand

A woman explores a crevice in a rock, Eagles Rock, Red Mountain Trail, Arizona, United States of America

Sea Stack, Dun Briste, in the water along the West coast of Ireland, Downpatrick Head, Wild Atlantic Way, Killala, County Mayo, Ireland

Lower Antelope Canyon with a beam of sunlight shining through a hole; Arizona, United States of America

Acidic pools, mineral formations, salt deposits in the crater of Dallol Volcano, Danakil Depression, Afar Region, Ethiopia

Acidic pools, mineral formations, salt deposits in the crater of Dallol Volcano, Danakil Depression, Afar Region, Ethiopia

The Twelve Apostles, limestone rock formations along the coast, Great Ocean Road, Port Campbell National Park; Port Campbell, Victoria, Australia