23. Badlands National Park, South Dakota
With one of the most unique landscapes in the world, the Badlands National Park is as stunning as it was inhospitable to early inhabitants. With dramatic erosion patterns creating unique pinnacles and buttes, this park is a living work of art. This hotbed for fossil discoveries has contributed considerably to our knowledge of prehistoric life. Today, you’ll most likely see buffalo, bighorn sheep and prairie dogs roaming the park. Badlands is also the largest undisturbed mixed grass prairie in the United States and home to the recently reintroduced and critically endangered black-footed ferret.
Image Source: Patrick Bolduan/Wikimedia Commons