Great Sand Dunes National Monument and Sangre de Cristo Mountains, 700 ft dunes are the tallest in North America, Colorado, USA, North America

Great Wall of China at Tengger desert sand dunes in Shapotou near Zhongwei, UNESCO World Heritage Site, Ningxia Province, China, Asia

Sand dunes, The Great Sand Sea, Western Desert, Egypt, North Africa, Africa

Great Sand Dunes and mountains with snow, Great Sand Dunes National Park and Preserve, Colorado, United States of America, North America

Great Sand Dunes and mountains with snow, Great Sand Dunes National Park and Preserve, Colorado, United States of America, North America

Two Rabari men climbing a dune with their dromedaries at sunset, Great Rann of Kutch Desert, Gujarat, India, Asia

Sand dune with frost at dawn, Great Sand Dunes National Park and Preserve, Colorado, United States of America, North America

Sand dunes at dawn, Great Sand Dunes National Park, Colorado, United States of America, North America

Sand dunes with grasses and ridges in foreground, Great Sand Dunes National Park, Colorado, United States of America, North America

Sand dunes at dusk, Great Sand Dunes National Park, Colorado, United States of America, North America

Sand Mountain Recreation Area, a 600ft sand dune popular with off-roaders, east of Fallon, by Highway 50 -'The loneliest road in America', The Great Basin, Nevada, United States of America (USA), North America

Sand Mountain Recreation Area, a 600ft sand dune popular with off-roaders, east of Fallon, by Highway 50 -'The Loneliest Road in America', The Great Basin, Nevada, United States of America (USA), North America

Sand ripples, Brampton Island, Holiday Island, Great Barrier Reef, Queensland, Australia

Great Sand Dunes National Park and Preserve, Alamosa County, Colorado, USA

Sand dunes in the great Sahara desert in Morocco

A beautiful model poses against the sand dunes in the great Sahara desert in Morocco

Tourists on camel riding through a lush green grass landscape towards the great Khorgoryn Els sand dunes in the Gobi Desert, Gurvan Saikhan National Park, Oemnoegov Aimak, Mongolia, Asia

Vacationers along Medano Creek in Great Sand Dunes National Park, Mosca, Colorado, USA

Tourists on camel riding through a lush green grass landscape towards the great Khorgoryn Els sand dunes in the Gobi Desert, Gurvan Saikhan National Park, Oemnoegov Aimak, Mongolia, Asia

Two camels in the evening light in front of the great sand dunes of Khorgoryn Els in the Gobi Desert, Gurvan Saikhan National Park, Oemnoegov Aimak, Mongolia, Asia

Two Rabari men going down a dune at sunset, silhouettes, Great Rann of Kutch, Gujarat, India, Asia

A beautiful model poses against the sand dunes in the great Sahara desert in Morocco

Sinous dune ridge in the great sand sea south of Siwa oasis, Egyptian Western Desert.

Great Point Lighthouse on overgrown beach against clear sky, Nantucket, Massachusetts, USA

View of Great Point lighthouse, Nantucket Island, Massachusetts

View of Great Point lighthouse, Nantucket Island, Massachusetts