Nidaros Cathedral, the northernmost medieval cathedral in the world, in Trondheim. #

The northern lights illuminate the sky over Reinfjorden in Reine, on Norway's Lofoten Islands, on September 8, 2017. #

A reindeer in Ny-Alesund in Norway's Svalbard archipelago on June 4, 2010. #

The cruise ship Disney Magic sails in Geirangerfjord toward Geiranger on June 10, 2015. #

A view of the town of Alesund, seen from Aksla Mountain on October 20, 2011. #

A young husky pup who will soon be used as a sled dog in Longyearbyen, on March 1, 2008. #

A pony walks in the snowy bay of Unstad, Lofoten Islands, on March 8, 2016. #

The beach of Unstad is photographed in the Lofoten archipelago on March 10, 2016. #

Cyclists ride during the third stage of the Tour des Fjords between Odda and Karmoy on May 26, 2017. #

A view of autumnal mountains named Horsnesfjellet and Hatten on the other side of Storfjorden in Troms County, in September of 2010. #

The northern lights fill the sky with dazzling green light above Kvaloya island at Tromso in the Arctic Circle in northern Norway. #

A two-year-old polar bear cub ventures close to a visiting boat over the moving ice flow in Vaigattfjellet, North Spitsbergen on June 6, 2012. #

Midnight sun reflects off the face of ridges on the west coast of Spitsbergen on the morning of Midsummer, June 21, 2008, in Longyearbyen. #

An arctic weasel runs on the snowy beach of Unstad, Lofoten Islands, on March 8, 2016. #

Surfers ride a wave at night near the snowy beach of Flackstad, in the Lofoten Islands, on March 12, 2016. #

Ona lighthouse, on the tiny island of Ona in Sandøy municipality, on September 6, 2010. #

An old fishing vessel used for tourist excursions sails off Norway's Lofoten Islands on February 8, 2012. #

A view of the Kronebreen Glacier, on the island of Spitsbergen, on July 23, 2015. #

Kongsbreen glacier, as it reaches the Norwegian fjord Kongsfjord, off the coast of Ny-Alesund on June 5, 2010. #

The fishing village of Hamnøy, Lofoten on October 22, 2016. #