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Steam plume from active vent beside crater lake, Volcan Poas, Cordillera Central, Costa Rica, Central America

Prayer flags on top of low pass on Barga Plain, with Mount Kailas (Kailash) beyond, sacred mountain for Buddhists and Hindus, Tibet, China, Asia

Yak train approaches Tarboche, prayer flag pole in Lha Chu canyon, on the kora round sacred mountain, Mount Kailas (Kailash), Tibet, China, Asia

Panoramic view over orange sand dunes towards mountains, Namib Rand private game reserve, Namibia, Africa

Aerial view of Himalaya mountain range, with Nanga Parbat, 8125m, seen from south west, rising above other mountains, Pakistan, Asia

Aerial view of mountains, glaciers and ice fields on the west coast of Spitsbergen on a commercial flight from Longyearbyen to Oslo, Svalbard, Norway, Scandinavia, Europe

Rock formation known as Swirls on Colorado Plateau, Arizona, United States of America (U.S.A.), North America

West Rim, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America (U.S.A.), North America

View of active volcano from helicopter, Big Island, Hawaii, Hawaiian Islands, United States of America (U.S.A.), North America

Backlit image of workers loaded with sulphur pieces cut out from a sulphur mine on Ijen crater lake, Java, Indonesia, Southeast Asia, Asia

Fully loaded baskets of sulphur ready to be carried out of the Ijen Volcano, Java, Indonesia, Southeast Asia, Asia

Workers carrying big pieces of sulphur out of the Ijen Volcano, Java, Indonesia, Southeast Asia, Asia

Worker carrying fully loaded baskets of sulphur out of the Ijen Volcano, Java, Indonesia, Southeast Asia, Asia

Afternoon light on the Perito Moreno Glacier, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America

Afternoon light on the Perito Moreno Glacier, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America

Perito Moreno Glacier at dawn, Los Glaciares National Park, UNESCO World Heritage Site, Patagonia, Argentina, South America

Hardknott Roman Fort interior looking west along the Eskdale Valley to the Solway Firth, South Lakes, Lake District National Park, Cumbria, England, United Kingdom, Europe

Corona Arch, Bootlegger Canyon, near Moab, Potash Road, Utah, United States of America, North America

Corona Arch, Bootlegger Canyon, near Moab, Potash Road, Utah, United States of America, North America

Corona Arch, Bootlegger Canyon, near Moab, Potash Road, Utah, United States of America, North America

Layered sandstone formation, Capitol Reef National Park, Utah, United States of America, North America

Layered sandstone formation, Capitol Reef National Park, Utah, United States of America, North America

Electricity pylons dominate the flat barren landscape, pointing to civilisation somewhere, Qatar, Middle East

Mineral stained pond on collapsed flank of Papandayan Volcano, an active four crater caldera, Garut, West Java, Java, Indonesia, Southeast Asia, Asia

Snow covered rocky moorland landscape overlooking the Bronze Age walled settlement of Grimspound, Dartmoor National Park, Devon, England, United Kingdom, Europe

Bronze Age walled settlement of Grimspound, isolated in a snow covered moorland wilderness, viewed from Hookney Tor overlook, Dartmoor National Park, Devon, England, United Kingdom, Europe

Snow covered stone hut circles in Bronze Age settlement of Grimspound in Dartmoor National Park, Devon, England, United Kingdom, Europe

View of a section of the Great Wall, UNESCO World Heritage Site, between Jinshanling and Simatai near Beijing, China, Asia

Great Wall of China, UNESCO World Heritage Site, and the Yellow River in the Tengger desert at Shapotou near Zhongwei, Ningxia Province, China, Asia

Great Wall of China, UNESCO World Heritage Site, and the Yellow River in the Tengger desert at Shapotou near Zhongwei, Ningxia Province, China, Asia

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

A particularly large social weaver bird nest growing in a dead acacia tree, NamibRand, Namib Desert, Namibia, Africa

The sun starts to light up the distant mountains in the NamibRand Nature Reserve, Namib Desert, Namibia, Africa

The setting sun lights up a lone acacia tree and the mountains of NamibRand, Namib Desert, Namibia, Africa

A large herd of Gemsbok (Oryx gazella) on the plains of the NamibRand Nature Reserve, Namib Desert, Namibia, Africa

Storm clouds and rainbow in the early evening in NamibRand Nature Reserve, Namib Desert, Namibia, Africa

Gemsbok (Oryx gazella) sheltering from the midday sun in the NamibRand Nature Reserve, Namib Desert, Namibia, Africa

Camelthorn trees (Acacia erioloba) in the clay pans of Deadvlei with Big Daddy dune towering above, Namib Naukluft, Namibia, Africa

Camelthorn trees (Acacia erioloba) in the clay pans of Deadvlei with Big Daddy dune towering above, Namib Naukluft, Namibia, Africa

Lone tree at the foot of Dune 45, with the distant dunes rendered silver and purple by the afternoon sun, Namib Naukluft, Namibia, Africa

The dunes and lagoon of Sandwich Harbour, just south of Walvis Bay and within the Namib Naukluft Park, Namibia, Africa

Chevron road lines on main highway through Malpais Grande National Park, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Petrified Forest National Park, Blue Mesa, Blue Mesa Trail, sedimentary layers of bluish bentonite clay

Aerial view from hot air balloon at dawn over magnificent desert landscape of sand dunes, mountains and Fairy Circles, Namib Rand game reserve Namib Naukluft Park, Namibia, Africa

Aerial view from hot air balloon over magnificent desert landscape of sand dunes, mountains and Fairy Circles, Namib Rand game reserve Namib Naukluft Park, Namibia, Africa

Early morning view across barren landscape towards sandstone mountains beneath dramatic sky, near Spitzkoppe, Namibia, Africa

Dead camelthorn tree said to be centuries old in silhouette against towering orange sand dunes bathed in evening light at Dead Vlei, Namib Desert, Namib Naukluft Park, Namibia, Africa

Aerial view from hot air balloon of sand road cutting across desert landscape covered in Fairy Circles, Namib Rand game reserve Namib Naukluft Park, Namibia, Africa

Aerial view from hot air balloon over magnificent desert landscape of sand dunes, mountains and Fairy Circles, Namib Rand game reserve Namib Naukluft Park, Namibia, Africa

Aerial view of mountains, glaciers and ice fields on the west coast of Spitsbergen on a commercial flight from Longyearbyen to Oslo, Svalbard, Norway, Scandinavia, Europe

Aerial view of mountains, glaciers and ice fields on the west coast of Spitsbergen on a commercial flight from Longyearbyen to Oslo, Svalbard, Norway, Scandinavia, Europe