February 17, 2014
From A Frozen Walk to Island Ice Caves, one of 18 photos. Sightseers look at a frozen rock face along the Apostle Islands National Lakeshore of Lake Superior, the world’s largest freshwater lake, near Cornucopia, Wisconsin, on February 14, 2014. According to the National Oceanic and Atmospheric Administration (NOAA) Great Lakes Environmental Research Laboratory, about 94% of Lake Superior is covered with ice, enabling thousands of people to visit the islands on foot for the first time since 2009. (Reuters/Eric Miller)

From A Frozen Walk to Island Ice Caves, one of 18 photos. Sightseers look at a frozen rock face along the Apostle Islands National Lakeshore of Lake Superior, the world’s largest freshwater lake, near Cornucopia, Wisconsin, on February 14, 2014. According to the National Oceanic and Atmospheric Administration (NOAA) Great Lakes Environmental Research Laboratory, about 94% of Lake Superior is covered with ice, enabling thousands of people to visit the islands on foot for the first time since 2009. (Reuters/Eric Miller)

January 29, 2014
From Snow Storms Hit the South, one of 20 photos. A truck driver slides off the highway in icy weather, as he tries to avoid another wrecked truck on I-65, in Clanton, Alabama, on January 28, 2014. Overnight, the South saw fatal crashes and hundreds of fender-benders. Jackknifed 18-wheelers littered Interstate 65 in central Alabama. Ice shut down bridges on Florida’s panhandle and the Lake Pontchartrain Causeway, one of the world’s longest spans, in Louisiana. Some commuters pleaded for help via cellphones while still holed up in their cars, while others trudged miles home, abandoning their vehicles outright. (AP Photo/Butch Dill)

From Snow Storms Hit the South, one of 20 photos. A truck driver slides off the highway in icy weather, as he tries to avoid another wrecked truck on I-65, in Clanton, Alabama, on January 28, 2014. Overnight, the South saw fatal crashes and hundreds of fender-benders. Jackknifed 18-wheelers littered Interstate 65 in central Alabama. Ice shut down bridges on Florida’s panhandle and the Lake Pontchartrain Causeway, one of the world’s longest spans, in Louisiana. Some commuters pleaded for help via cellphones while still holed up in their cars, while others trudged miles home, abandoning their vehicles outright. (AP Photo/Butch Dill)

January 7, 2014
From Icy Days and Nights, one of 34 photos. Here, tourists visit the ice buildings on display at the Grand Ice and Snow World during the 30th Harbin International Ice & Snow Sculpture Festival on January 5, 2014 in Harbin, China. This year’s Ice and Snow World features the theme “Global Ice and Snow Dream, World Cartoon Tour”. Photographed with a variable plane lens. (Lintao Zhang/Getty Images)

From Icy Days and Nights, one of 34 photos. Here, tourists visit the ice buildings on display at the Grand Ice and Snow World during the 30th Harbin International Ice & Snow Sculpture Festival on January 5, 2014 in Harbin, China. This year’s Ice and Snow World features the theme “Global Ice and Snow Dream, World Cartoon Tour”. Photographed with a variable plane lens. (Lintao Zhang/Getty Images)

December 23, 2013
From A Christmas Ice Storm, one of 17 photos. A layer of ice coats the leaves of a Japanese maple tree after an ice storm in Toronto, Ontario, on December 22, 2013. (Reuters/Chris Helgren)

From A Christmas Ice Storm, one of 17 photos. A layer of ice coats the leaves of a Japanese maple tree after an ice storm in Toronto, Ontario, on December 22, 2013. (Reuters/Chris Helgren)

October 22, 2013
From Using Giant Mirrors to Light up Dark Valleys, one of 9 photos. In the town of Rjukan, Norway, people gather in front of the town hall, where sunlight is reflected by giant mirrors (top) erected on the mountainside, on October 18, 2013. Rjukan, a small industrial town 150 km west of Oslo, is situated in the bottom of a valley between steep mountains in Telemark County, and is cut off from direct sunlight for five to six months a year. Now, three giant mirrors mounted on a nearby mountainside will reflect winter sunlight into the valley. (Reuters/Tore Meek/NTB Scanpix)

From Using Giant Mirrors to Light up Dark Valleys, one of 9 photos. In the town of Rjukan, Norway, people gather in front of the town hall, where sunlight is reflected by giant mirrors (top) erected on the mountainside, on October 18, 2013. Rjukan, a small industrial town 150 km west of Oslo, is situated in the bottom of a valley between steep mountains in Telemark County, and is cut off from direct sunlight for five to six months a year. Now, three giant mirrors mounted on a nearby mountainside will reflect winter sunlight into the valley. (Reuters/Tore Meek/NTB Scanpix)

February 27, 2013
From A Siberian Winter, one of 31 photos. Here, a man walks through a tunnel formed by ice crystals from surrounding permafrost, outside the village of Tomtor in the Oymyakon valley in northeast Russia, on January 28, 2013. The coldest temperatures in the northern hemisphere since the beginning of the 20th century were recorded in the Oymyakon valley, known as the northern “Pole of Cold”, reaching a temperature of -67.8 degrees Celsius (-90 degrees Fahrenheit) in 1933. (Reuters/Maxim Shemetov)

From A Siberian Winter, one of 31 photos. Here, a man walks through a tunnel formed by ice crystals from surrounding permafrost, outside the village of Tomtor in the Oymyakon valley in northeast Russia, on January 28, 2013. The coldest temperatures in the northern hemisphere since the beginning of the 20th century were recorded in the Oymyakon valley, known as the northern “Pole of Cold”, reaching a temperature of -67.8 degrees Celsius (-90 degrees Fahrenheit) in 1933. (Reuters/Maxim Shemetov)

January 10, 2013
From Wintry Weather: Middle East Edition, one of 32 photos. Boys play in the courtyard of the Sultanahmet mosque, known as the Blue mosque, during a snow storm in Istanbul, Turkey, on January 8, 2013. (Reuters/Murad Sezer)

From Wintry Weather: Middle East Edition, one of 32 photos. Boys play in the courtyard of the Sultanahmet mosque, known as the Blue mosque, during a snow storm in Istanbul, Turkey, on January 8, 2013. (Reuters/Murad Sezer)

January 9, 2013
From Wintry Weather, one of 34 photos. Frost covers the tips of a woman’s hair as she shields her face while facing the abnormally freezing outdoors in the Siberian city of Novosibirsk, about 2,800 km east of Moscow, on December 14, 2012. The temperatures in Novosibirsk had dropped to -35C (-31F). (Valery Titievsky/AFP/Getty Images)

From Wintry Weather, one of 34 photos. Frost covers the tips of a woman’s hair as she shields her face while facing the abnormally freezing outdoors in the Siberian city of Novosibirsk, about 2,800 km east of Moscow, on December 14, 2012. The temperatures in Novosibirsk had dropped to -35C (-31F). (Valery Titievsky/AFP/Getty Images)

December 12, 2012
From Sochi 2014: An Olympic Preview, one of 26 photos. A view of the Bolshoi Ice Palace construction site at the Olympic Park in the Russian Black Sea resort of Sochi, on December 16, 2011. The Olympic Park will be able to accommodate about 75,000 visitors when full, and all the ice arenas will be within walking distance of one other. Sochi will host the 2014 Winter Olympics that start on February 7, 2014. (Mikhail Mordasov/AFP/Getty Images)

From Sochi 2014: An Olympic Preview, one of 26 photos. A view of the Bolshoi Ice Palace construction site at the Olympic Park in the Russian Black Sea resort of Sochi, on December 16, 2011. The Olympic Park will be able to accommodate about 75,000 visitors when full, and all the ice arenas will be within walking distance of one other. Sochi will host the 2014 Winter Olympics that start on February 7, 2014. (Mikhail Mordasov/AFP/Getty Images)