Synopsis

The first explorers to venture beyond the Missouri's headwaters returned with accounts of an extraordinary place. They described valleys appearing to perpetually smoke and burn, and a river that refused to freeze even during the most severe winters. This is Yellowstone, America’s oldest national park. Though two and a half million visitors gather there each summer, winter reveals another aspect, largely unseen. Bison seek refuge in the warmth of hot springs, while geysers attain a striking beaut