Photo: Jacob W. Frank/NPS, Bison Crossing the Road
Key dates: The United States Congress established Yellowstone National Park in 1872. On March 1, 1872, President Ulysses S. Grant signed the Yellowstone National Park Protection Act into law. The world’s first national park was born.
Yellowstone National Park on the Web
Retrospective: Historic Mammoth Hotel in Yellowstone National Park through the years