The world’s first national park, Yellowstone National Park in Wyoming, Montana and Idaho, was established on this day in 1872. Passed by Congress and signed by President Ulysses S. Grant, the Yellowstone National Park Protection Act says “the headwaters of the Yellowstone River… is hereby reserved and withdrawn from settlement, occupancy, or sale… and dedicated and set apart as a public park or pleasuring-ground for the benefit and enjoyment of the people.” With incredible geothermal features, amazing wildlife and stunning scenery, there’s no wonder why Yellowstone continues to fascinate us after all these years. Help protect it for future generations by taking the Yellowstone Pledge. Photo by Jacob W. Frank, National Park Service.