A lone ice fisherman endures cold but clear conditions on the Kajjfjordvatnet near Tromsø, Norway.

Climbing a frozen waterfall is tricky anytime, but after dark it poses special challenges. Although only 3:00 in the afternoon, Mikal Nerberg must use his headlamp to see ice axe placements on this winter climb in Norway's Lyngen Alps.

A happy Finnish dog races across frozen Tulkinsalmi Lake in Finland's frigid far north.

Jari Rorn, a Lapland Shaman, walks onto the frozen lake where he ice fishes. A lifelong resident of northernmost Finland, he is a master of survival in this extreme environment.