244,000 rugged acres of geological formations, prairie grass & wildlife like bison & bighorn sheep.
"Mt. Rushmore is by no means the only worthwhile destination in the frequently overlooked state of South Dakota. Punctuating the fairly flat state, the Badlands contain rock formations that have resulted from millions of years of deposition and erosion. The Badlands Loop Road is beloved by photographers and a perfect entry point for day hikes. Vistors to this park may be lucky enough to spot bighorn sheep, prairie dogs, bison, and black-footed ferrets. The Sage Creek Wilderness Area is well separated from the crowds." [Travel+Leisure]
National Park
Website: Badlands National Park
Address: 25216 SD-240, Interior, SD 57750
Sources: Best National Park in Every State