The U.S. national park famous for its geyser and hot springs is Yellowstone National Park. Established in 1872, it was the first national park in the world. Boasting a variety of geothermal features, Yellowstone's most famously is Old Faithful, which erupts regularly and draws numerous visitors. The park also covers diverse ecosystems and wildlife, including bison and grizzly bears, making it a significant area for conservation and exploration. Its stunning landscapes range from mountains to vast forests, enhancing its appeal as a premier outdoor destination.