1. Barrow,  Alaska, USA: Endless winter nights in the northernmost US city.

2. Yellowknife, Canada: A haven for Northern Lights  enthusiasts.

3. Oymyakon, Russia: Life at -50°C, the coldest inhabited  place.

4. Harbin, China: A frozen wonderland of sculpted ice.

5. Reykjavik,  Iceland: Fire and ice coexist in this Nordic capital.

6. Ulaanbaatar, Mongolia: Surviving high-altitude winters.

7. Nuuk, Greenland: Pristine wilderness and Arctic culture.

8.  Anchorage,  Alaska, USA: Alaska's urban gateway to winter adventure.