This sandstone natural bridge is the largest in the state. The natural rock shelter underneath the arch was excavated by archeologists in 1957. Their findings showed that people they called Paleo-Indians lived in the shelter 12,000 years ago and apparently hunted megafauna like mastodons and woolly mammoths in the shadow of the retreating glaciers. (The park is about 10 miles west of Hwy. 12 on County Highway C in Sauk County.