Rock Bridge State Park is a park of 2273 acres full of many caves, sinkholes, underground streams and small springs. The rock bridge, one of the most popular features in the park, was seperated from the rest of the cave system when a portion of the cave ceiling collasped. In the 1800's, a stone dam was built at the rock bridge to take advantage of the water for their mill. The first papermill west of the Mississippi River was operating at the site in 1834 followed by a whiskey distillery in 1847. For many years the natural bridge was a meeting place of the area during the hot summer months because of its natural wonders and cool air. It is also a place of where people did plays, political rallies, dances, and family reunions. The Devils Icebox is a double sinkhole that offers a view of the underground stream. The cave of the Devils Icebox is a completly mapped passage of more than seven miles. Wildlife in the cave includes grey bats, pink planarians (a species of flatworm), the eastern pipistrelle, and the dark sided salamander. Tours of the icebox is closed except for those registered in advanced in September, October, and April. Conners Cave, downstream, can be explored at any time. Park staffs lead tours of Icebox boardwalk and Conners Cave for groups who make advanced reservations. There are picnic sites throughout the park as well as a reservable picnic shelter and playground equipment.