Yellowstone National Park, an 11,000-year-old natural wonder, is perhaps one of the most famous parks in the world. Stretching across Wyoming and dipping into both Montana and Idaho, the park has more than 2 million acres to its name. In addition to its infamous geysers, the region is full of lush forest, stunning rivers and incredible waterfalls. Not to mention, it’s also home to more than 100 species of mammals, birds, fish and reptiles.