The Scandinavian Mountains - snow-covered, windswept, inhospitable and wild. This tundra creates life for ancient creatures like musk oxen, arctic fox and fabled reindeer.

The Top of the World uncovers a vast frozen wilderness marked by unique artic wildlife, age-old traditions and a battle against the harshest winters.

From Finland's far north, wild Viking Rivers inspire explorers from across the globe, from daring ice-skaters to naked ice-swimmers.