We travel through northern Japan, which enjoys some of the heaviest snowfall in the world. Fly in a hot-air balloon over the sweeping snowscape of Furano in Hokkaido Prefecture. Trek through 2m-deep snow in primeval forests wearing snowshoes. And what's a trip to chilly climes without a soak in a hot spring? Also, our correspondent gives a tour of snow monsters and a fiery festival on a chilly winter's night. Discover icy jewels, walk through blizzards, canoe a frozen river, play in powder snow, and more...