National Park Service, Wyoming.
On March 1, 1872, Yellowstone became the first national park for all to enjoy the unique hydrothermal and geologic wonders. Theses wonders were captured a year earlier in the art of William Henry Jackson’s photographs, Thomas Moran’s paintings, and Henry Elliot’s sketches during the 1871 Hayden Expedition. Their work inspired Congress to preserve the area.
Yellowstone National Park covers nearly 3,500 square miles in the northwest corner of Wyoming (3% of the park is in Montana and 1% is in Idaho). Yellowstone has five entrance stations, and several are closed to regular vehicles during winter. It takes many hours to drive between these entrances, so be sure to check the status of roads at the entrance you intend to use while planning your trip and before you arrive.