9. Nuuk (Greenland) -29.5C
With fantastic ice scenery on its doorstep, Nuuk is one of the world's most unique capitals. Visitors can take a helicopter ride over Greenland's vast ice sheet, visit Norse ruins or take a wildlife boat safari to see whales cavorting around the coastline. The National Museum, situated in the Nuuk's old quarter near the fjord, is the place to learn more about Greenland's frozen past and its fascinating present.