Walker in country lane in frosty wintry landscape in The Cotswolds, Oxfordshire, UK

Young couple sitting on park bench in deep snow in Tromso, Norway

Christmas Ice Rink in the Market Square, Bruges, West Vlaanderen (Flanders), Belgium, Europe

Ice cream, Siena, Tuscany, Italy, Europe

Winter ice skating rink, Somerset House, London, England, United Kingdom, Europe

Straumengard Museum in log cabin at Straumsfjord on Kvaloya Island near Tromso in Arctic Circle Northern Norway

Cathedral in Tromsoya, Tromso, Arctic Circle in Northern Norway

Homes and fishing huts in hamlet across fjord from Sandneshamnvegen 862 on Kvaloya Island, Tromso, Arctic Circle, Northern Norway

People walk across snow-covered Hampstead Heath, London, United Kingdom

Ice Bar, Ice Hotel, Kiruna, Lapland, Arctic Circle, Sweden, Scandinavia, Europe

Bedroom Corridor inside the Sorrisniva Igloo Hotel (Ice Hotel), Alta, Arctic Circle, Norway, Scandinavia, Europe

Hikers nearing ice flow of the Monte Rosa glacier, Zermatt Alpine Resort, Valais, Switzerland, Europe

Tourists in rigid inflatable boat approach a seal lying on the ice, west coast of the Antarctic Pensinula, Antarctica, Polar Regions

Jokulslarlon glacial lagoon, Vatnajokull Icecap, south area, Iceland, Polar Regions

Lindblad Expeditions guests in a Zodiac as seen through an arch in an iceberg at Cierva Cove, Antarctica, Polar Regions

The Bernina Express train in the snowy landscape of Morteratsch, Engadine, Canton of Graubunden, Switzerland, Europe

Icebergs at dawn off Laurie Island, South Orkney Islands, Polar Regions

Shop fronts and street scene in the city of Tromso, in the Arctic Circle in Northern Norway

Lobster for sale in Alma, New Brunswick, Canada, North America

Sorrisniva Igloo Hotel, snow or ice hotel, striking sculpture in lobby, Alta, Winter, Finnmark, Arctic Circle, North Norway, Scandinavia, Europe

Icicles on the face of the Athabasca Glacier, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Ice Hotel, Kiruna, Lapland, Arctic Circle, Sweden, Scandinavia, Europe

Gentoo penguins (Pygoscelis papua) and tourists on a zodiac, Cuverville Island, Antarctic Peninsula, Antarctica, Polar Regions

Churchill River from the airplane, Churchill, Hudson Bay, Manitoba, Canada, North America

Gullfoss waterfall in winter, Golden Circle, Iceland, Polar Regions

Ice sculptures in Taiyangdao Park, Ice Lantern Festival, Bingdeng Jie, Harbin city, Heilongjiang, China, Asia

The Lindblad Expeditions ship National Geographic Explorer wedged into fast ice, Duse Bay, Weddell Sea, Antarctica, Polar Regions

The Lindblad Expeditions ship National Geographic Explorer wedged into fast ice, Duse Bay, Weddell Sea, Antarctica, Polar Regions

Pitstop for snowmobiling group among arctic alps in the Arctic Circle near Holt in the region of Tromso, Northern Norway

Street scene of couple walking their dog in Tromsoya, Tromso, Arctic Circle in Northern Norway

Ice Rink and Christmas Market in the Market Square, Bruges, West Vlaanderen (Flanders), Belgium, Europe

Cave guide wearing protective hard hat inside one of the ice caves under the Vatnajokull Glacier, South Iceland, Polar Regions

Lindblad guests from the National Geographic Explorer on a Zodiac cruise in Cierva Cove, Antarctica, Polar Regions

Polar bear walking on the ice, Billefjord, Svalbard, Spitzbergen, Arctic, Norway, Scandinavia, Europe

Ringed seal (Phoca hispida) pup, Billefjord, Svalbard, Spitzbergen, Artic, Norway, Scandinavia, Europe

Ice skating in Red Square, UNESCO World Heritage Site, Moscow, Russia, Europe

Arctic wilderness in Ovre Dividal National Park in the Arctic Circle region of Tromso, Northern Norway

Hoar frost on tree and field in frosty wintry landscape in The Cotswolds, Oxfordshire, UK

Two people walk by St John At Hampstead Parish Church and graveyard, North London, UK

Snow covered trees on Hampstead Heath, London, United Kingdom

Ice plant (Hottentot fig) (Carpobrotus edulis), yellow form, flowering in a dense carpet, Praia do Martinhal dunes, Portugal, Europe

Man taking photo of icebergs on the glacial lake at Jokulsarlon with snow on the massive icecap of Vatnajokull behind, Iceland, Polar Regions

One of the last remaining Inughuit subsistence hunters, Naimanngitsoq Kristiansen, stands on watch with his rifle for marine mammals at the ice edge, Greenland, Denmark, Polar Regions

Moss covered lava beds surround Snaefellsjokull, an active strato volcano capped in snow and ice, on the Snaefellsnes Peninsula, North West area, Iceland, Polar Regions

Ice-breaker tour ship, Krossfjorden icebergs, Spitsbergen, Svalbard, Norway, Scandinavia, Europe

Zodiac from ice breaker tour ship, Krossfjorden icebergs, Spitsbergen, Svalbard, Arctic, Norway, Scandinavia, Europe

Ozone bar (highest in the world) in Ritz Carlton inside ICC, Kowloon, Hong Kong, China, Asia

Ice sculptures, Ice Hotel, Quebec, Quebec, Canada, North America

Polar bear (Ursus maritimus) on pack ice, Spitsbergen, Svalbard, Norway, Scandinavia, Europe

Guests from the Lindblad Expeditions ship National Geographic Explorer with polar bear (Ursus maritimus), Cumberland Peninsula, Baffin Island, Nunavut, Canada, North America

Gornergrat mountain range and Gorner glacier (Gornergletscher), above Zermatt in the Swiss Alps, Valais, Switzerland, Europe

The 9th Lake Baikal Ice marathon, Lake Baikal, Irkutsk Oblast, Siberia, Russian Federation, Eurasia

Reindeer herd in the snow in arctic landscape at Kval?ysletta, Kvaloya Island, Tromso in Arctic Circle Northern Norway

Fresh fish on sale in traditional old Chinese Soho food market in Graham Street, Central Hong Kong, China

Snow covered street lamp in North London, England, United Kingdom

The chapel, Ice Hotel, Kiruna, Lapland, Arctic Circle, Sweden, Scandinavia, Europe

Inuit hunter walking his dog team on the sea ice, Greenland, Denmark, Polar Regions

Glacier, Perito Moreno, Argentina, South America

Frozen lake below Cerro Catedral, Bariloche, Argentina, South America

Icebergs from the Kangia Ice Fiord seen from hills above Sermermiut, Ilulissat (Jacobshavn), west coast, Greenland, Polar Regions

Emperor penguins (Aptenodytes forsteri), Snow Hill Island, Weddell Sea, Antarctica, Polar Regions

Iceberg detail, Pleneau Island, Antarctic Peninsula, Antarctica, Polar Regions

Fresh fish on sale in traditional old Chinese Soho food market in Graham Street, Central Hong Kong, China

Couple walk hand in hand across snow-covered Hampstead Heath, North London, United Kingdom

The Lindblad Expeditions ship National Geographic Explorer in Shorefast Ice, Antarctic Sound, Antarctica, Polar Regions

Vernadsky Research Base, the Ukrainian Antarctic station at Marina Point on Galindez Island in the Argentine Islands, Antarctica, Polar Regions

Visitors from ice-breaker tour ship, July 14 Glacier, Krossfjorden, Spitsbergen, Svalbard, Norway, Scandinavia, Europe

Skating on ice rink, Varosliget city park lake, with Vajdahunyad castle in the background, Budapest, Hungary, Europe

Greenland, Polar Regions

Open air ice rink, Broadgate, City of London, London, England, United Kingdom, Europe

Smirnoff Ice Bar, Ice Hotel, Quebec, Quebec, Canada, North America

Ice skating outside the Natural History Museum, London, England, United Kingdom, Europe

Jostedalsbreen Glacier, Fjaerland, Norway, Scandinavia, Europe

Hoar frost on winter's day in woodland in The Cotswolds, Gloucestershire

Tourists in a Zodiac looking at a leopard seal (Hydrurga leptonyx), Enterprise Island, Antarctica, Polar Regions

Twilight view of the Ice Rink on St. Andrew Square, Edinburgh, Lothian, Scotland, United Kingdom, Europe

Sculptures of ice in the interior rooms of the Ice Hotel, Jukkasjarvi, Kiruna, Norrbotten County, Lapland, Sweden, Scandinavia, Europe

Art suite, Ice Hotel, Jukkasjarvi, Kiruna, Norrbotten County, Lapland, Sweden, Scandinavia, Europe

Magdalene Fjord, Spitsbergen, Norway, Scandinavia, Europe

Perito Moreno glacier, Patagonia, Argentina, South America

Aerial view of Siple Station, main base is 40ft under the ice, United States Antarctic Program, Antarctica, Polar Regions

Under the glacier, Perito Moreno, Argentina, South America

Frozen river, Rumbak valley, Hemis National Park, Ladakh, India, Asia

Glacier walk tour, Fox Glacier, West Coast, South Island, New Zealand, Pacific

Nisqually Glacier in foreground, with Mount Rainier, the volcano which last erupted in 1882, 4392m high, beyond, Cascade Mountains, Washington State, United States of America (U.S.A.), North America

The Lindblad Expeditions ship National Geographic Explorer wedged into fast ice, Duse Bay, Weddell Sea, Antarctica, Polar Regions

Iceberg, Weddell Sea, Antarctic Peninsula, Antarctica, Polar Regions

Rockefeller Center Ice Rink, Manhattan, New York, New York State, United States of America, North America

Glacier detail in Icy Arm, Baffin Island, Nunavut, Canada, North America

Ice skaters at the town hall Hotel de Ville at Christmas season, Paris, Ile de France, France, Europe

Woman walks dog on winter's day across snow-covered Hampstead Heath, North London, England, United Kingdom

Icicles on the face of the Athabasca Glacier, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Winter Wonderland, City Hall, Cardiff, Wales, United Kingdom, Europe

Icebergs in the glacial melt water lagoon, Jokulsarlon Breidamerkurjokull, South area, Iceland, Polar Regions

Lava beds surround Snaefellsjokull, an active strato volcano capped in snow and ice, on the Snaefellsnes Peninsula, North West area, Iceland, Polar Regions

Tourists in zodiac from ice-breaker tour ship, Krossfjorden icebergs and glacier, Spitsbergen, Svalbard, Norway, Scandinavia, Europe

Crevasses, Mendenhall Glacier, Juneau Icefield, Alaska, United States of America, North America

Polar bear on pack ice north of Spitsbergen, Svalbard, Arctic, Norway, Scandinavia, Europe, Polar Regions

Garibaldi Glacier, Darwin National Park, Tierra del Fuego, Patagonia, Chile, South America

Fish restaurant, Shinjuku, Tokyo, Honshu, Japan, Asia