Colin Monteath / Mountaineer enjoying the view of Mt Everest and the Himalayan Mountains at sunset from Gokyo Ri, Khumbu, Nepal

Pete Oxford / Chagras or cowboys on an overnight ride at a hacienda during the annual cattle round-up, with Mt Antisana in the background, Ecuador

Pete Oxford / Chagra cowboys herding cattle and burning the hillsides to keep cattle on the move and rejuvenate the pasture at a hacienda during the annual overnight cattle round-up, Andes Mountains, Ecuador

Konrad Wothe / Tourists on Russian icebreaker breaking through pack ice, Antarctica

Konrad Wothe / Cardon (Pachycereus pringlei) cactus photographed by tourist, largest cacti in the world and may live over 200 years, Sonoran Desert, Baja California, Mexico

Matthias Breiter / Two climbers at Ruth Glacier, with Mt McKinley towering above them, Denali National Park and Preserve, Alaska

Tui De Roy / Galapagos Sea Lion (Zalophus wollebaeki) group photographed by tourists, Gardner Bay, Hood Island, Galapagos Islands, Ecuador

Michio Hoshino / Illuminated tent beneath snow-covered mountains and Aurora borealis, Alaska

Norbert Wu / Snorkeler Deanna Mah at The Baths, British Virgin Islands

Jim Brandenburg / Farm house and tree-lined road in winter, Minnesota

Nick Upton / Felled conifer trees stacked beside forestry track through mixed forest. Near Muraka Forest Reserve, a rare surviving home for Siberian flying squirrel (Pteromys volans). Near Lisaku, Estonia. April 2...

Nick Upton / Felled trees stacked beside forestry track through mixed forest. A few metres outside protected limits of Muraka Forest Reserve, a remaining habitat of Siberian flying squirrel (Pteromys volans). Esto...