Welcome to Yellowstone

On March 1, 1872, President Ulysses S. Grant signed the Yellowstone National Park Protection Act, creating the world's first national park. But this 2.2-million-acre wilderness isn't just a park — it's a supervolcano. Beneath your feet, a magma chamber the size of a small city bubbles at 1,500°F. The result: more than half the world's geysers, rainbow-colored hot springs, and a landscape that's equal parts beautiful and terrifying.

Yellowstone sits atop a geological hotspot where the Earth's mantle plume pushes molten rock dangerously close to the surface. Three cataclysmic eruptions — 2.1 million, 1.3 million, and 631,000 years ago — have shaped the terrain you see today. The caldera from the most recent blast stretches 30 by 45 miles, so enormous that early explorers didn't even realize they were standing inside a volcano.

Today we explore 8 stops across this living, breathing geological wonder — from the clockwork eruptions of Old Faithful to the wolf packs that rewrote an entire ecosystem. Let's go.