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

Cala Napoletana, island of Caprera, Maddalena archipelago, island of Sardinia, Italy, Mediterranean, Europe

Cala Mariolu, Cala Gonone, Golfe di Orosei (Orosei gulf), island of Sardinia, Italy, Mediterranean, Europe

Cala Mariolu, Cala Gonone, Golfe di Orosei (Orosei gulf), island of Sardinia, Italy, Mediterranean, Europe

Wave-cut arch in limestone headland, Durdle Door, Jurassic Heritage Coast, UNESCO World Heritage Site, Isle of Purbeck, Dorset, England, United Kingdom, Europe

Wave-cut platform, and chalk cliffs, Flamborough South Landing, Yorkshire, England, United Kingdom, Europe

Shrine guarded by Bodhisattva figures, dating from 7th century, in Cave 5, Ellora, UNESCO World Heritage Site, near Aurangabad, Maharashtra state, India, Asia

Shiva the great ascetic, Kailasa, Ellora, UNESCO World Heritage Site, Maharashtra state, India, Asia

Angel Falls from Rio Churun, Canaima National Park, UNESCO World Heritage Site, Venezuela, South America

Spectacular coastline with waterfall, Julia Pfeiffer Burns State Park, Big Sur, California, United States of America, North America

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

People snorkelling at Praia da Atalaia inside natural swimming pools, Parque Nacional de Fernando de Norohna, Fernando de Noronha, Pernambuco, Brazil, South America

Brown booby (Sula leucogaster), Parque Nacional de Fernando de Norohna, Fernando de Noronha, Pernambuco, Brazil, South America

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

Ryoanji temple, dry stone garden and blossom, UNESCO World Heritage Site, Kyoto city, Honshu island, Japan, Asia

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

Enjoying the surf at Tamarama, south of Bondi Beach, in the eastern suburbs, Sydney, New South Wales, Australia, Pacific

Indian petroglyphs drawn on red standstone by scratching away dark desert varnish of iron oxides, Newspaper Rock, Canyonlands, Utah, United States of America, North America

Coastline, Acadia National Park, Maine, New England, United States of America (U.S.A.), North America

Lighthouse from the causeway at low tide, Corbiere, St. Brelade, Jersey, Channel Islands, United Kingdom, Europe

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

Sedimentary rocks, blue lias, shale-limestone sequences, Lyme Regis, Jurassic coast, UNESCO World Heritage Site, Dorset, England, United Kingdom, Europe

Ogygiopsis klotzi, fossil, trilobite 50mm long with small fault through it, Cambrian, Burgess Shale, Yoho, Canada, North America

Sedimentary rocks, clay, colour banded by iron oxides, horizontal Triassic Chinle Clay, Blue Mesa, Painted Desert, Arizona, United States of America, North America

View of Koh Ping-gan from Koh Ta Poo, known as James Bond island, Phang-Nga Bay, Thailand, Southeast Asia, Asia

View of Koh Ping-gan from Koh Ta Poo, known as James Bond island, Phang-Nga Bay, Thailand, Southeast Asia, Asia

Bronze Age rock carvings dating from between 1500 and 1000 BC, depicting hunter with a bow, Bohuslan, Tanum, UNESCO World Heritage Site, Sweden, Scandinavia, Europe

Bronze Age rock carvings dating from between 1500 and 1000 BC, Bohuslan, Tanum, UNESCO World Heritage Site, Sweden, Scandinavia, Europe

Sun disk symbol with animals, Hallristningar rock carvings dating from between 1500 and 1000 BC, Tanum, UNESCO World Heritage Site, Sweden, Scandinavia, Europe

The Burren famous glaciated karst pavement landscape of limestone and dry stone walls, County Clare, West of Ireland

Twyfelfontein rock engravings (petroglyphs), dating from the Late Stone Age between 6000 and 2000 years, UNESCO World Heritage Site, Kunene region, Namibia, Africa

Indian rock carving, Writing-on-Stone Provincial Park, UNESCO World Heritage Site, Alberta, Canada, North America

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

Coastal sea cliffs and stacks, near Cape Wrath and Sandwood Bay, Highland region, Scotland, United Kingdom, Europe

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

Farmhouse beneath limestone scarp, Glwyseg mountain, Llangollen, Clwyd, Wales, United Kingdom, Europe

Water flowing from a natural spring through Cotswolds stone and Wild Watercress at Swinbrook, the Cotswolds, Oxfordshire, UK

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

Cala Mariolu, Cala Gonone, Golfe di Orosei (Orosei gulf), island of Sardinia, Italy, Mediterranean, Europe

Man building a dry stone wall using Cotswolds stones and traditional skills (without using cement) in the Cotswolds, England

Cueva de Los Verdes, cave tourist attraction in lava pipe tunnel, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Close-up of cross on Christian Bieta Danaghel, Vierges Martyres, town of Lalibela, Wollo region, Ethiopia, Africa

Black Rock cottage, Rannoch Moor, Western Highlands, Highland region, Scotland, United Kingdom, Europe