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Walkers in montane grassland environment,showing erosion by humans of footpath, Horton Plains National Park, Sri Lanka, Asia

Aurora borealis (Northern Lights) dance above the Lindblad Expeditions ship National Geographic Explorer in Hudson Strait, Nunavut, Canada, North America

Aurora borealis (Northern Lights) dance above the Lindblad Expeditions ship National Geographic Explorer in Hudson Strait, Nunavut, Canada, North America

Visitors watching mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

Visitors to an active andesite stratovolcano on White Island, off the East side of North Island, New Zealand, Pacific

Jagged mountain peaks, Raftsundet Strait, tour boat in Trollfjorden fiord, Lofoten Islands, northern Norway, Scandinavia, Europe

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Camp 1, climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Expedition cruise vessel in Hornesund Fjord in summer sunshine, Spitzbergen, Svalbard, Arctic Norway, Scandinavia, Europe

Russian research vessel and tourist ship Akademik Ioffe anchored off Half Moon Island, South Shetland Islands, Antarctic Peninsula, Antarctica, Polar Regions

Tourists walking through a penguin colony at Pleneau Island, Antarctic Peninsula, Antarctica, Polar Regions

Snow covered mountain and tourists, Half Moon Island, South Shetland Islands, Antarctic Peninsula, Antarctica, Polar Regions

Eco tourists cruise around an Iceberg graveyard in Zodiac boats, Hidden Bay, Antarctica, Polar Regions

Russian research vessel and tourist ship Akademik Ioffe anchored off Pleneau Island, Antarctic Peninsula, Antarctica, Polar Regions

Tourists hiking down the mountainside towards Whalers Bay, Deception Island, South Shetland Islands, Antarctic Peninsula, Antarctica, Polar Regions

Tourists crossing the mountains that rim the volcanic caldera of Deception Island, South Shetland Islands, Antarctic Peninsula, Antarctica, Polar Regions

A geological formation known as the Flaming Cliffs where Andrew Shapman expedition discovered the first dinosaurs eggs, Mongolia, Central Asia, Asia

Australis expedition cruise ship anchored in front of Navarino island, Tierra del Fuego, Chile, South America

Zodiac boat, expedition tourists, landing beach, Half Moon Island, Livingston Island view, South Shetland Islands, Antarctica, Polar Regions

Expedition tourists kayaking in snowy weather, with blue icebergs, Chilean Gonzalez Videla Station, Waterboat Point, Antarctica, Polar Regions

Expedition tourists kayaking in cold, snowy weather, with icebergs, Chilean Gonzalez Videla Station, Waterboat Point, Antarctica, Polar Regions

Climbing expedition leaving base camp on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Abandoned Dawada oasis village at Gabraoun, Touareg, Gabroun, Sahara desert, Fezzan, Libya, North Africa, Africa

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Summit ridge, climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Leaving camp 4, climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Aurora borealis (Northern Lights) dance above the Lindblad Expeditions ship National Geographic Explorer in Hudson Strait, Nunavut, Canada, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Expedition ship visit, Damoy Hut, former British Air Transit Facility, Historic Monument, Dorian Bay, Wiencke Island, Antarctica, Polar Regions

Summit ridge, climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mt McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Damoy Hut, expedition ship visitor in the snow, Historic Monument, Dorian Bay, Wiencke Island, Antarctic Peninsula, Antarctica, Polar Regions

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

An Everest expeditioner sits among his mountain of equipment while he checks his email with a satelite modem, Khumbu Region, Nepal, Asia

Expedition visit, British Historic Monument Damoy Hut and Bahia Dorian Argentine Refuge, Dorian Bay, Wiencke Island, Antarctica, Polar Regions

Expedition tourists leave Half Moon Island, Livingston Island blue glaciers and evening sun, South Shetland Islands, Antarctica, Polar Regions

On the Trail with Pack Mules transporting gear to Kyanjin Gompa, Langtang Valley trek, Himalayas, Nepal, Asia

The Majestic Tserko Ri Peak overlooking the Upper Langtang valley on the Langtang Valley trek, Himalayas, Nepal, Asia

Close-up of a Horned Yak and mountainous backdrop on the Langtang Valley trek, Himalayas, Nepal, Asia

Solitary yak above Kyanjin Gompa settlement, with Himalayan ridges and snowy valley floor stretching through Langtang, Nepal

Views of the abandoned whaling station in Stromness Bay on South Georgia in the Southern Ocean, Polar Regions

Views of the abandoned whaling station in Stromness Bay on South Georgia in the Southern Ocean, Polar Regions

Views of the Chilean research base Presidente Eduardo Frei Montalva, Antarctica, Southern Ocean, Polar Regions

Views of the Trinity Church at Belingshausen Russian Research Station, Antarctica, Southern Ocean, Polar Regions

Antarctic tern (Sterna vittata), on the wreck of the Guvernoren in the Enterprise Islands, Antarctica, Southern Ocean, Polar Regions

Antarctic tern (Sterna vittata), on the wreck of the Guvernoren in the Enterprise Islands, Antarctica, Southern Ocean, Polar Regions

Brown capuchin monkey (Cebus apella) (Sapajus apella) on tree, Tambopata National Reserve, Puerto Maldonado, Tambopata Province, Madre de Dios, Peru, South America

Southern elephant seal (Mirounga leonina) bull holding adult female in the surf to mate with her, South Georgia, Polar Regions

Views of the abandoned whaling station in Stromness Bay on South Georgia in the Southern Ocean, Polar Regions

View of tidewater glacier deep inside Neko Harbor on the western side of the Antarctic Peninsula, Southern Ocean, Polar Regions

View of tidewater glacier cave found deep inside Neko Harbor on the western side of the Antarctic Peninsula, Polar Regions