Yellowstone National Park
The world's first National Park, Yellowstone is situated over three states -- southern Montana, eastern Idaho and northern Wyoming -- and can be accessed through entrances near Bozeman, Cook City, Livingston and West Yellowstone. The park features 3,472 square miles of wilderness that include 290 waterfalls and more than 300 geysers, including the famous Old Faithful, which erupts roughly once per hour. The park features more than 950 miles of hiking trails and 60-plus species of wildlife. Yellowstone is open year-round and offers different experience during summer and winter seasons.