Yellowstone National Park is home to 60% of the world's active geysers and was established in 1872 as the first national park by President Ulysses S. Grant. The park spans parts of Wyoming, Idaho, and Montana and contains geothermal features like Old Faithful geyser, as well as wildlife including wolves and coyotes. Yellowstone faces challenges such as wildfires and invasive species threatening the native fish populations.