Tainter Cave

Tainter Cave, also known as Tombstone Cave, is a dry sandstone cave in Crawford County, Wisconsin, in which prehistoric Native Americans carved petroglyphs and drew pictographs, including birds, men, deer, and abstract designs. With over 100 pictographs, the cave holds more than any other known site in Wisconsin. It is also notable as the first archaeological site recorded in the dark zone of a cave in the Upper Midwest.

Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).