Wide angle view of the ripples and dunes of the Erg Chebbi Sand sea, part of the Sahara Desert near Merzouga, Morocco, North Africa, Africa

Wide angle view of the ripples and dunes of the Erg Chebbi Sand sea, part of the Sahara Desert near Merzouga, Morocco, North Africa, Africa

Camels being led over dunes of the Erg Chebbi sand sea, part of the Sahara Desert near Merzouga, Morocco, North Africa, Africa

Bayanzag Cliffs, site of dinosaur fossil discoveries, Dalanzadgad, Gobi Desert, southern Mongolia, Asia

Colourful horse and riders at a Tribal festival, Sahel, Chad, Africa

Colourful horse rider at a Tribal festival, Sahel, Chad, Africa

Camel caravan, Guelta d'Archei waterhole, Ennedi plateau, UNESCO World Heritage Site, Chad, Africa

Bactrian camels, Badain Jaran Desert, Gobi Desert, Inner Mongolia, China, Asia

Mongol monastery of Badain Jilin, Badain Jaran Desert, Gobi Desert, Inner Mongolia, China, Asia

Bactrian camels, Badain Jaran Desert, Gobi Desert, Inner Mongolia, China, Asia

Badain Jaran Desert, Gobi Desert, Inner Mongolia, China, Asia

Mongol monastery of Badain Jilin, Badain Jaran Desert, Gobi Desert, Inner Mongolia, China, Asia

Mongol monastery of Badain Jilin, Badain Jaran Desert, Gobi Desert, Inner Mongolia, China, Asia

Badain Jaran Desert, Gobi Desert, Inner Mongolia, China, Asia

Badain Jaran Desert, Gobi Desert, Inner Mongolia, China, Asia

Statue of Gengis, Mongol emperor, Badain Jaran Desert, Gobi Desert, Inner Mongolia, China, Asia

Badain Jaran Desert, Gobi Desert, Inner Mongolia, China, Asia

Badain Jaran Desert, Gobi Desert, Inner Mongolia, China, Asia

Tuaregs riding on their camels, near Tamanrasset, Algeria, North Africa, Africa

Late evening sunlight on a deserted Marloes Sands, Pembrokeshire, Wales, United Kingdom, Europe

Camels walking across desert, Merzouga Desert, Region de Erfoud, Morocco

Devils Racetrack, Death Valley National Park, California, United States of America, North America

Aerial of Atlantic Ocean coastline, Skeleton Coast Park, Namibia, Africa

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

Saguaro cactus detail, Tucson, Pima County, Arizona, United States of America, North America

Looking towards the dunes of Sossusvlei, with two tiny figures on the lower ridge of the dune, Namib Naukluft, Namibia, Africa

Dead trees and orange sand dunes, Dead Vlei, Sossusvlei dune field, Namib-Naukluft Park, Namib Desert, Namibia, Africa

Rising sun catching the summit of towering orange sand dunes with reflections in the flooded pan of Sossusvlei caused by rare heavy rainfall, Namib Desert near Sesriem, Namib Naukluft Park, Namibia, Africa

Montana de Medio, mountain, Los Ajaches mountain range, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Grape vines growing in black volcanic pits in La Geria, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Tourists riding camels at Mount Mingshan, Dunhuang, Gansu Province, China, Asia

Sand dunes at Huacachina Oasis, Peru, South America

Panoramic view of mountains and dune glowing in last light before sunset, Namib Rand, Namib Naukluft Park, Namibia, Africa

Al Deir (Ed Deir) (The Monastery), Petra, UNESCO World Heritage Site, Jordan, Middle East

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

Local nomads drive camels across the desolate landscape of Lac Abbe, Djibouti, Africa

Ming Sha sand dunes and pavilion at Crescent Moon Lake, Dunhuang, Gansu Province, China, Asia

A Tuareg on the dunes of the erg of Murzuk in the Fezzan desert, Libya, North Africa, Africa

Soft pinks at dusk, Sossusvlei, Namib Naukluft, Namibia, Africa

Moroccan camel driver, Dunes of Erg Chebbi, Merzouga, Meknes-Tafilalet, Morocco, North Africa, Africa

Ruins of pre-Spanish Mahos village, Poblado de la Atalayita, Pozo Negro, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Arab couple in the desert, Erg Awbari, Sahara desert, Fezzan, Libya, North Africa, Africa

Interior of building slowly being consumed by the sands of the Namib Desert in the abandoned former German diamond mining town of Kolmanskop, Forbidden Diamond Area near Luderitz, Namibia, Africa

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

Erg Chebbi Sahara Desert sunset from the top of a 150m sand dune, near Merzouga, Morocco, North Africa, Africa

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

Singing Dunes, Altyn-Emel National Park, Almaty region, Kazakhstan, Central Asia, Asia

Kasbah Tamnougalt, Draa Valley, near Agdz, Morocco, North Africa, Africa

Tuaregs riding on their camels, near Tamanrasset, Algeria, North Africa, Africa

Palais Claudio Bravo, Taroudant, Sous Valley, Morocco, North Africa, Africa

Qusayr Amra, Umayyad bath complex, Jordan, Middle EastBuilt in the desert by Caliph Walid I, 700-715, contains well preserved period frescos

El Tatio geyser basin on altiplano, boiling pool with algal colour zoning, Atacama Desert, Chile, South America

Cham Tower of Phan Thiet, Thuan Hai, Vietnam, Indochina, Southeast Asia, Asia

Ruined city of Jiaohe, Turpan on the Silk Route, UNESCO World Heritage Site, Xinjiang Province, China, Asia

Tengger desert sand dunes in Shapotou near Zhongwei, Ningxia Province, China, Asia

Muslim man praying in the desert, Sebha, Ubari, Libya, North Africa, Africa

Looking towards Big Daddy and Mummy dunes at Deadvlei, Namib Naukluft, Namibia, Africa

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

Hikers hiking in desert and sand dunes, Paracas National Reserve (Reserva Nacional de Paracas), Ica, Peru, South America

Botanical gardens at Rodalquilar, Cabo de Gata natural park, Almeria, Andalusia, Spain, Europe

View over coastal plain to Atlantic Ocean coastline from Tamellalt, southern Morocco, North Africa, Africa

For Sale sign in desert. Sand Dunes Point, Death Valley National Park, California, United States of America, North America

Cactus plants inside Jardin de Cactus designed by Cesar Manrique, including Echinocactus grusonii from Mexico, Guatiza, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Spotted hyena (Crocuta crocuta), Zimanga game reserve, South Africa, Africa

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

Saguaro cacti and barrel cacti in bloom, Saguaro National Park, Rincon Mountain District, Tucson, Arizona, United States of America, North America

Panorama of the dunes and surrounding scenery of NamibRand at dawn, Namib Desert, Namibia, Africa

Evening light on the sand dunes at Sossusvlei, Namib Naukluft, 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

Al Ula, seen from Harrate viewpoint, North West Saudi Arabia, Middle East

Al Gharameel, sandstone towers, near Al Ula, North West Saudi Arabia, Middle East

Four wheel drive on desert dunes, Wahiba, Oman, Middle East

Colourful camel riders at a tribal festival, Sahel, Chad, Africa

Camel caravan, Guelta d'Archei waterhole, Ennedi plateau, UNESCO World Heritage Site, Chad, Africa

Sand dunes/dune sea at sunset, Namib Rand Game Reserve, Namib Naukluft Park, Namibia

Penstemon flowers, Mount St. Helens, Mount St. Helens National Volcanic Monument, Washington state, United States of America, North America

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

The pyramids of Meroe, Sudan's most popular tourist attraction, Bagrawiyah, Sudan, Africa

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

Standing in the desolate landscape of Lac Abbe, Djibouti, Africa

Ming Sha sand dunes and pavilion at Crescent Moon Lake, Dunhuang, Gansu Province, China, Asia

Dune 7, Walvis Bay, Namibia, Africa

The stunning desert scenery of Wadi Rum, Jordan, Middle East

The gentle light of dawn on the Camelthorn trees of Deadvlei, Namib Naukluft, Namibia, Africa

Bedouins playing with stones in the sand, Douz, Kebili, Tunisia, North Africa, Africa

Panoramic view of the Ancient orange sand dunes of the Namib Desert at Sossusvlei, near Sesriem, Namib Naukluft Park, Namibia, Africa

Sand dune landscape at Erg Chebbi Desert, Sahara Desert near Merzouga, Morocco, North Africa, Africa

Tourists silhouetted on a camel ride at night, Erg Chebbi Desert, Sahara Desert near Merzouga, Morocco, North Africa, Africa

Cactus plants inside Jardin de Cactus designed by Cesar Manrique, Guatiza, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Racing camels raised in the Dubai Desert, Dubai, United Aran Emirates, Middle East

Sand dunes at sunset near Dubai, United Arab Emirates, Middle East

Palais Claudio Bravo, Taroudant, Sous Valley, Morocco, North Africa, Africa

Ming Sha sand dunes and pavilion at Crescent Moon Lake, Dunhuang, Gansu Province, China, Asia

Sand dunes at Las Dunas natural park, Corralejo, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Bactrian camel train along base of huge sand dunes, blue skies on a summer evening, Khongoryn Els, Gobi Desert, Mongolia, Central Asia, Asia

Pinnacles Desert, Nambung National Park, Western Australia, Australia

Elephant (Loxodonta africana) and calf, Chobe National Park, Botswana, Africa

The pyramids of Meroe, Sudan's most popular tourist attraction, Bagrawiyah, Sudan, Africa

Tuareg pouring tea, Sebha, Ubari, Libya, North Africa, Africa

Evening light on the sand dunes at Sossusvlei, Namib Naukluft, Namibia, Africa