Valley of the Moon, Atacama Desert, Chile

A shack in the Outback, New South Wales, Australia

Outback shack, New South Wales, Australia

Zagora, Draa Valley, Anti Atlas mountains, Morocco, North Africa, Africa

Camel caravan, Khongoryn Els dune, Gobi Desert National Park, Omnogov, Mongolia

A bedouin (bedu) camp, Wadi Rum, Jordan, Middle East

Arid landscape, Wadi Rum, Jordan, Middle East

Mt. McKinley, Denali National Park, Alaska, USA

Camel trek in Sahara dunes near Merzouga, Morocco, North Africa

Dunes of the Erg Chebbi, Sahara Desert near Merzouga, Morocco, North Africa

Glacier and trekker from summit at Uhuru Peak, Kilimanjaro National Park, Tanzania, Africa

Bajrawiya, the Pyramids of Meroe, Sudan, Africa

Sand dunes, Death Valley National Monument, California, USA

Band-i-Amir, Afghanistan, Asia

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

Sahara Desert, Algeria, North Africa, Africa

Babur's Alcove, Kandahar, Afghanistan

Atacama Desert, Chile, South 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, Spitzkoppe, Namibia, Africa

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

Dune and tree, Namib Naukluft Park, Namib Desert, Namibia, Africa

Panoramic view of rock arch, Spitzkoppe, Namibia, Africa

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

Animal skull, rocks and cracked dry earth, Outback, South Australia, Australia, Pacific

Akakus, Sahara Desert, Fezzan, Libya, North Africa, 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

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

Delicate Arch, Arches National Park, Moab, Utah, United States of America (U.S.A.), North America

Park Avenue, Arches National Park, Moab, Utah, 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

Bedouin Camp, Wadi Rum, Jordan, Middle East

Camel, Erg Chebbi, Merzouga, Sahara Desert, Morocco, North Africa, Africa

Camels, Erg Chebbi, Merzouga, Sahara Desert, Morocco, North Africa, Africa

Bedouin on camel in the desert, Wadi Rum, Jordan, Middle East

Sand dunes and electricity pylons dominate the desert landscape, Qatar, Middle East

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

Mammoth River, Wrangel Island, UNESCO World Heritage Site, Chukotka, Russian Far East, Eurasia

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

Sunrise from the dunes of NamibRand, Namib Desert, Namibia, Africa

Brooding clouds over the vivid red dunes of NamibRand, Namib Desert, Namibia, Africa

Sunset 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

The road from the Skeleton Coast joins Damaraland, 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

A couple of springbok enjoy a peaceful evening at Sossusvlei, Namib Naukluft, Namibia, Africa

Mirador Sicasumbre mountain top viewpoint, Pajara, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Car driving on unsurfaced road, Atlantic Ocean coast, Jandia peninsula, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

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

Road sign in the Atacama Desert, Norte Grande, Chile, South America

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

Motorway A7 road running through limestone desert, Paraje Natural de Karst en Yesos, Almeria, Andalusia, Spain, Europe

Reconstruction of buildings, Los Millares prehistoric Chalcolithic settlement archaelogical site, Almeria, Andalusia, Spain, Europe

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

Panoramic view showing trees and grass-covered orange sand dunes, Namib Rand game reserve, 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

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

Volcanic landscape of solidified lava flows and distant cone volcanoes, near Yaiza, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Olive trees near village of Aldea de Guaro, limestone mountains, Periana, Axarquia, Andalusia, Spain, Europe

Hikers inside Forni Glacier, Forni Valley, Stelvio National Park, Valtellina, Lombardy, Italy, Europe

Sandstone pillars on the Patagonian Steppe, Patagonia, Argentina, South America

Salar de Uyuni is the largest salt flat in the world and is in South West Bolivia, Bolivia, South America

Cacti on Isla de los Pescadores, Volcan Tunupa and the salt flats, Salar de Uyuni, Southwest Highlands, Bolivia, South America

Isla de los Pescadores and salt flats, Salar de Uyuni, Southwest Highlands, Bolivia, South America

Desert in the Avaroa Andean Fauna National Reserve, Bolivia, South America

Desert in the Avaroa Andean Fauna National Reserve, Bolivia, South America

Rainbow Arch, in sandstone, north of Al Ula, North West Saudi Arabia, Middle East

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

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

An ovoo, traditional place of worship in the middle of the Mongolian countrtyside, Mongolia, Central Asia, 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

The mountainous scenery of the Zanskar River, Ladakh, Himalayas, India, Asia

The turquoise, saline water of Tso Pangong, backed by mountains, Ladakh, India, Asia

Horses and nomad tents on the shores of Tso Thadsang Karu, Ladakh, India, Asia

The mountainous scenery of the Zanskar River, Ladakh, Himalayas, India, Asia

Flight over the Himalayas from Delhi to Leh, Himalayas, India, Asia

Mountains and poplars at sunrise from Leh, Ladakh, Himalayas, India, Asia

First light on the mountains flanking the lake of Tso Pangong, Ladakh, India, Asia

Incredible colours on patterns on the mountainous shores of Tso Moriri, Ladakh, India, Asia

After harvesting quinoa, farmers have to thresh the seedheads and winnow the seeds to remove the husk, South-Western Bolivia, South America