The Madison Valley and Yellowstone
The world’s first national park and the largest in North America, Yellowstone sits atop North America’s largest volcanic field. The caldera (a large cauldron-like hollow) was formed when land collapsed following the last of three super-eruptions that took place over the past 2.1 million years. It’s a land of steaming springs, geysers, bubbling mud pots and soaring landscapes that almost defy imagination.