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

Walkers crossing stepping stones over a cascading stream in Tollymore Forest Park, County Down, Ulster, Northern Ireland, United Kingdom, Europe

Herd of goats on road, near Benimaurell, Vall de Laguar, Marina Alta, Alicante province, Spain, Europe

Women and children walking on a country road, carrying bundles of firewood, Chautara, north of Kathmandu, Nepal, Asia

Lion (Panthera leo), and tourist vehicle, Kruger National Park, South Africa, Africa

Neko Harbour, Antarctic Peninsula, Antarctica, Polar Regions

Neko Harbour, Antarctic Peninsula, Antarctica, Polar Regions

Road Sign warning of bends in road, Red Centre, Australia

Footpath sign, Chedworth, Gloucestershire, United Kingdom

Reportage on the Jeunes Pousses, a follow-up care and pneumo-pediatric rehabilitation unit specializing in climate therapy for asthma, Briançon, France

Blonde woman with hat standing out car window

Hikers follow a route along the Colorado River that connect Tapeats Creek and Thunder River to Deer Creek in the Grand Canyon outside of Fredonia, Arizona November 2011. The 21.4-mile loop starts at the Bill Hall trailhead on the North Rim and descends 2000-feet in 2.5-miles through Coconino Sandstone to the level Esplanada then descends further into the lower canyon through a break in the 400-foot-tall Redwall to access Surprise Valley. Hikers connect Thunder River and Tapeats Creek to a route along the Colorado River and climb out Deer Creek.

Three Southern giraffes (Giraffa giraffa angolensis) walk along sandy track in Chobe National Park, Botswana

Footprints in white sand along shoreline at sunset

Senior couple riding mountain bikes, Utah, United States

Couple hiking in desert

Off-road vehicles driving in desert

Off-road vehicles driving on rock formation

Women jogging on cliff along water

People hiking in desert

Family hiking in desert

Off-road vehicles driving through desert

People hiking in desert

Couple hiking in desert

People hiking in desert

Group of people running on trail, Salt Flats, Utah, United States

Vallee de La Claree, two hikers on the GR country of the Tour du Mont Thabor, flowering Rhododendron ferrugineux, in the background the Cerces massif (3093m), Nevache, Hautes-Alpes, France

Wild boars run across a path, Sus scrofa, Female with young, Germany, Europe

Transhumance of Herens cows, Val de Nandaz, Valais, Switzerland

Transhumance of Herens cows, Val de Nandaz, Valais, Switzerland

Transhumance of Herens cows, Val de Nandaz, Valais, Switzerland