First, a plume of heat wells up from deep within the planet and melts rock just beneath ... of the Snake River Plain. The last three super-eruptions have been in Yellowstone itself.

Editor’s Note: This story accompanies the May 2016 issue of National Geographic magazine, devoted entirely to America’s first national park. Find more at natgeo ...

Site of half the world's active geysers and about the same size as Cyprus, Yellowstone National Park's scenery and wildlife ...

The canyon is anywhere from 800 to 1,200 feet deep and features multiple falls that cascade down the Yellowstone River, including ... including its many colors and rock formations.