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Sipapu Natural Bridge, Natural Bridges National Monument, Utah, United States of America, North America

Boulders and hoodoos at first light, Bisti Wilderness, New Mexico, United States of America, North America

Mnajdra, a Megalithic temple constructed at the end of the third millennium BC, UNESCO World Heritage Site, Malta, Europe

Limestone pillars in the Pinnacles Desert, Nambung National Park, Western Australia, Australia, Pacific

Sculptured rock formations, Devil's Garden, Grand Staircase Escalante, Utah, United States of America, North America

The Pinnacles limestone formations at sunset contained within Nambung National Park, Western Australia, Australia, Pacific

Silouetted sandstone formation at dawn, Coyote Buttes Wilderness, Vermilion Cliffs National Monument, Arizona, United States of America, North America

Mnajdra, a Megalithic temple constructed at the end of the third millennium BC, UNESCO World Heritage Site, Malta, Europe

The Pinnacles limestone formations at sunset in Nambung National Park, Western Australia, Australia, Pacific

The Pinnacles limestone formations at sunset in Nambung National Park, Western Australia, Australia, Pacific

Mnajdra, a Megalithic temple constructed at the end of the third milennium BC, UNESCO World Heritage Site, Malta, Europe

The Pinnacles limestone formations at sunset contained within Nambung National Park, Western Australia, Australia, Pacific

Sipapu Natural Bridge, Natural Bridges National Monument, Utah, United States of America, North America

The Pinnacles limestone formations at sunset in Nambung National Park, Western Australia, Australia, Pacific

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

Old millstones left at quarried edge of gritstone (millstone grit), Stanage Edge, Peak District National Park, Derbyshire, England, United Kingdom, Europe

Ha Long (Ha-Long) Bay, UNESCO World Heritage Site, Hong Gai, Vietnam, Indochina, Southeast Asia, Asia

Ha Long (Ha-Long) Bay, UNESCO World Heritage Site, Hong Gai, Vietnam, Indochina, Southeast Asia, Asia

View from limestone pavement across the Jamison Valley in the Blue Mountains National Park where the blue haze is caused by eucalyptus oil, near Katoomba, UNESCO World Heritage Site, New South Wales (N.S.W.), Australia, Pacific

Looking out through entrance of cave, Deer Cave, Gunung Mulu National Park, UNESCO World Heritage Site, Sarawak, island of Borneo, Malaysia, Southeast Asia, Asia

Remarkable Rocks, Flinders Chase National Park, Kangaroo Island, South Australia, Australia, Pacific

Part of Nourlangie Rock, sacred aboriginal shelter and rock art site, Kakadu National Park, UNESCO World Heritage Site, Northern Territory, Australia, Pacific

Tufa towers at Lac Abhe (Abbe), formed by hot springs beneath old lake at higher level, Afar Triangle, Djibouti, Africa

Tufa towers at Lac Abhe (Abbe), formed by hot springs beneath old lake at higher level, Afar Triangle, Djibouti, Africa

People canoeing near Tham Law (tube cove), Ao Phang-Nga Marine Park, Phang Nga province, Thailand, Southeast Asia, Asia

View of Praia do Conceicao beach and Morro do Pico in the background, Parque Nacional de Fernando de Norohna, Fernando de Noronha, Pernambuco, Brazil, South America

Red rock formations and jangada boat on the seafront of Canoa Quebrada, Canoa Quedrada, Ceara', Brazil, South America

Through the Bocche di Vulcano, facing the crater on Vulcano, Aeolian Islands, UNESCO World Heritage Site, island of Sicily, Italy, Mediterranean, Europe

Folded limestone and shale, Jurassic period, Stair Hole, Lulworth, Dorset, England, United Kingdom, Europe

Close-up of coloured sandstone from which the Nabateans carved their city, Petra, Jordan, Middle East

Volcanic rock formations on south eastern coast, Kleftiko, Milos, Cyclades islands, Greece, Mediterranean, Europe

Coastal scene, Halong (Ha Long) Bay, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Castlerigg Stone Circle (the Druid's Circle), Lake District National Park, Cumbria, England, UK, Europe

Rocky amphitheatre with pool, at head of Cathedral Gorge, Purnululu National Park, UNESCO World Heritage site, Bungle Bungle, Kimberley, Western Australia, Australia, Pacific