The Badlands National Park, is a national park in southwestern South Dakota that protects 242,756 acres (379.306 sq mi; 98,240 ha) Cotton-candy yellows and pinks color the hills of Badlands National Park in South Dakota. The Badlands’ striking formations contain one of the world’s richest fossil beds, carrying clues to ancient mammals like rhinos and saber-toothed cats that once roamed here. Natural Wonders of the World. Wonders of Soil Erosion. Look at its gorgeous view.