Badlands National Park is considered home to one of the world's richest deposits of mammal fossil beds. The Oglala Lakota Nation, the second-largest American Indian Reservation in the United States, co-manages half of Badlands National Park.hose who traverse the lower prairie to the south, however, can't miss it; it rises above them like a city skyline in ruins, petrified. The Badlands Wall, much of which is preserved within the boundaries of Badlands National Park, may not conform to everyone's idea of beauty, but nobody can deny its theatricality.