Piney Creek State Natural Area is a unique 198-acre area purchased for its rare plant species and natural features. It is one of only 2 locations in Illinois where short-leaf pines grow naturally. It also contains the largest body of prehistoric rock art in Illinois. Almost 200 designs, both petroglyphs and pictographs, from the Late Woodland and Mississippian periods can be found in the ravine. There is a 2.2-mile hiking loop that features a waterfall. Hiking, sightseeing and wildlife viewing are permissible, but because it is a dedicated nature preserve other activities are not allowed.