Kuchie nomad camel train, between Chakhcharan and Jam, Afghanistan, Asia

Kuchie nomad camel train, between Chakhcharan and Jam, Afghanistan, Asia

Valley of the Moon, Atacama Desert, Chile

Party of trekkers on top of dunes at Chigaga, Draa Valley, Morocco, North Africa

Camel at the Khongryn dunes, Gobi desert, Gobi National Park, Omnogov Province, Mongolia, Central Asia, Asia

Dawn ridges, near Namib Naukluft Park, Namibia, Africa

Sand dunes, Grand Erg Occidental, Sahara Desert, Algeria, Africa

Outback shack, New South Wales, Australia

Close-up of sand dunes in Erg Chebbi sand sea, Sahara Desert, near Merzouga, Morocco, North Africa, Africa

Bedouins, Sinai, Egypt, North Africa

Painted rocks, Tafraoute, Morocco, North AfricaIn 1984 Belgian artist Jean Verame used 18 tonnes of paint and the help of a group of Moroccan firemen to paint the granite boulders in the anti-Atlas country west of Tafraoute

Camel train through desert, Morocco, North Africa

Young berber boy, Dades Valley, Morocco, North Africa

Tea ceremony, Tafilalt, Morocco, North Africa

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

Footsteps, desert scenery, Wadi Rum, Jordan, Middle East

Sand dunes, Maspalomas, Gran Canaria, Canary Islands, Spain, Europe

Sandy dunes, Maspalomes, Gran Canaria, Canary Islands, Spain

Arid landscape, Wadi Rum, Jordan, Middle East

Ancient city ramparts, archaeological site of Babylon, Iraq, Middle East

Ship's graveyard near Aralsk, on seabed due to water losses, Aral Sea, Kazakhstan, Central Asia

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

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

Sahara Desert, Hoggar Mountains, sunrise over Assekrem, Algeria, North Africa

Pinnacle Desert, Western Australia

Chiquicamata Coppermine, Atacama Desert, Chile, South America

Bajrawiya, the Pyramids of Meroe, Sudan, Africa

Panoramic view of trees and mountains in desert landscape, Namib Rand game reserve, Namib Naukluft Park, Namibia, Africa

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

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

Camels, Central Desert, Northern Territory, Australia

Jabal Rum, desert landscape in Southern Jordan, Wadi Rum, Jordan, Middle East

1st century AD Nabatean Corinthian Tomb, Wadi Musa, Petra, Jordan, Middle East

View over Graeco-Roman city towards Roman Temple of Bel, 45 AD, Palmyra, Syria, Middle East

Irrigated winter wheat, oasis in Gobi Desert, Gansu Province, China, Asia

Pyramid of Menkewre (left), pyramid of Chephren (centre), pyramid of Cheops (right), Giza, Egypt, North Africa, Africa

Sahara Desert, Algeria, North Africa, Africa

The Pyramids, Giza, UNESCO World Heritage Site, near Cairo, Egypt, North Africa, Africa

Tuareg and wife leading camel train through the desert near Djanet, Algeria, North Africa

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

Panoramic view of dead trees and orange sand dunes, Dead Vlei, Namib Desert, Namibia, Africa

Panoramic view of dead trees and orange sand dunes, Dead Vlei, Namib Desert, Namibia, Africa

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

Panoramic view over dunes, Sossusvlei, Namib Naukluft Park, Namib Desert, Namibia, Africa

Panoramic view of rock arch, Spitzkoppe, Namibia, Africa

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

Sand dunes and sea beyond, Maspalomas, Gran Canaria, Canary Islands, Spain, Europe

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

Flap-necked Chameleon, (Chamaeleo dilepsis), Etoscha National Park, Namibia

Camel guide and camels, rolling sand dunes of the Erg Chebbi dune sea, Sahara Desert, near Merzouga, Morocco, North Africa, Africa

Nubian man in desert, near St. Simeon's monastery, Aswan, Egypt, North Africa, Africa

Porters, Mui Ne, Vietnam, Indochina, Southeast Asia, Asia

Porters, Mui Ne, Vietnam, Indochina, Southeast Asia, Asia

Landscape and century plant, Baja, Mexico, North America

Ancient Sahira Dam at the Pre-Aksumite settlement of Qohaito, Eritrea, Africa

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

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

Berber man standing with his camel, Erg Chebbi, Sahara Desert, Merzouga, Morocco, North Africa, Africa

Man in traditional dress in the desert outside Dubai, United Arab Emirates, Middle East

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

Sand dune blocks road in the Qatari desert, Qatar, Middle East

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

Berber camel leader with three camels in Erg Chebbi sand dunes, Sahara Desert, near Merzouga, Morocco, North Africa, Africa

Sand dunes in Erg Chebbi sand sea, Sahara Desert, near Merzouga, Morocco, North Africa, Africa

Beach, Luskentyre, North Harris Mountains, Isle of Harris, Outer Hebrides, Scotland, United Kingdom, Europe

Springbok (Antidorcas marsupialis), Kgalagadi Transfrontier Park, Northern Cape, South Africa, Africa

Aerial of sand dunes, Skeleton Coast Park, Namib Desert, Namibia, Africa

Namaqua chameleon (Chamaeleo namaquensis), Namibia, Africa

A man on mule-back traverses the desert around the ancient city of Old Dongola, Sudan, Africa

The royal cemetery of Nuri, burial place of King Taharqa, ancient ruler of the Kingdom of Kush, Karima, Sudan, Africa

The Khatmiyah mosque at the base of Taka Mountain, Kassala, Sudan, Africa

A Bedouin guide with his camel, overlooking the Pyramids of Giza, UNESCO World Heritage Site, Cairo, Egypt, North Africa, Africa

A Bedouin guide on camel-back overlooking the Pyramids of Giza, UNESCO World Heritage Site, Cairo, Egypt, North Africa, Africa

A Bedouin guide with his camel, overlooking the Pyramids of Giza, UNESCO World Heritage Site, Cairo, Egypt, North Africa, Africa

A Bedouin guide and camel approaching the Pyramids of Giza, UNESCO World Heritage Site, Cairo, Egypt,North Africa, Africa

Deir al Bahri, Funerary Temple of Hatshepsut, Valley of the Kings, Thebes, UNESCO World Heritage Site, Egypt, North Africa, Africa

Deir al Bahri, Funerary Temple of Hatshepsut, Valley of the Kings, Thebes, UNESCO World Heritage Site, Egypt, North Africa, Africa

Umm El Ma lake, Erg Awbari, Sahara desert, Fezzan, Libya, North Africa, Africa

Tourist camp, Erg Awbari, Sahara desert, Fezzan, Libya, North Africa, Africa

Sand dunes at night, Erg Awbari, Sahara desert, Fezzan, Libya, North Africa, Africa

Akakus, Sahara desert, Fezzan, Libya, North Africa, Africa

Tent and SUV in desert, Erg Awbari, Sahara desert, Fezzan, Libya, North Africa, Africa

The flat expanse of the Grand Barra Depression, Djibouti, Africa

The desolate landscape of Lac Abbe, dotted with limestone chimneys, Djibouti, Africa

Chinese girl horseriding, Xilamuren grasslands, Inner Mongolia province, China, Asia

The flat expanse of the Grand Barra Depression, Djibouti, Africa

The flat expanse of the Grand Barra Depression, Djibouti, Africa

Nomadic camel herders lead their herd to a watering hole in rural Somaliland, northern Somalia, Africa

Maspalomas dunes, Gran Canaria, Canary Islands, Spain, Europe

Returning on horseback, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

Bottle-tree (Adenium obesum), endemic to island, known as desert rose, Diksam Plateau, central Socotra Island, Yemen, Middle East

Backlit hoodoos and Thor's Hammer, Bryce Canyon National Park, Utah, United States of America, North America

View from Sunset Point at sunset, Bryce Canyon National Park, Utah, United States of America, North America

Kasbah near Essaouira, Morocco, North Africa, Africa

Anti Atlas mountains between Tata and Tafraoute, Morocco, North Africa, Africa

Tropical desert island, Maldives, Indian Ocean, Asia

The Pyramids of Giza, Giza, UNESCO World Heritage Site, near Cairo, Egypt, North Africa, Africa

The Pyramids of Giza, Giza, UNESCO World Heritage Site, near Cairo, Egypt, North Africa, Africa

The Pyramids of Giza, Giza, UNESCO World Heritage Site, near Cairo, Egypt, North Africa, Africa

Wadi Dana, Dana Nature Reserve, Jordan, Middle East