Yellowstone National Park: The World's First National Park

Yellowstone National Park holds the distinction of being the oldest national park in the world. Established on March 1, 1872, by an act of the U.S. Congress and signed into law by President Ulysses S. Grant, Yellowstone set a global precedent for the conservation of natural landscapes for public enjoyment and scientific study. Spanning over 2.2 million acres across Wyoming, Montana, and Idaho, the park sits atop a massive volcanic hotspot, giving rise to its famous geothermal features—more than 10,000 hydrothermal sites including geysers, hot springs, mud pots, and fumaroles. The iconic Old Faithful geyser, along with the Grand Prismatic Spring and the Yellowstone Caldera, draws millions of visitors annually. Beyond its geothermal wonders, Yellowstone shelters a remarkably intact temperate ecosystem, home to grizzly bears, wolves, bison, elk, and hundreds of bird species. Its creation marked the birth of the national park idea, inspiring over 100 nations to establish their own protected areas. Today, Yellowstone remains a UNESCO World Heritage Site and a living laboratory for ecology, geology, and wilderness preservation.