America the Beautiful: Mighty Northwest

The perilous peaks of western Montana hide an ancient secret: America's glacier lands. The ice-carved valleys, steep slopes, and hidden lakes make a high alpine maze for a dazzling array of wildlife. This is realm of sure-footed mountain goats, dancing dipper birds, and the grizzly bear. Snowmelt and giant glaciers provide water for all - and the ice even has its own inhabitants. (National Geographic)