Tyson Spring Cave

Tyson Spring Cave is a cave located in southeastern Minnesota's Fillmore County. The region is within the Driftless Area, a region noted for its karst topography, which includes caves and sinkholes. Tyson's cave is a solutional cave privately owned by the Minnesota Cave Preserve. It is known for the extinct ice-age bones found scattered throughout the cave rooms. The majority of this extensive cave is approximately 120 feet below the surface and is estimated to be 3.5–5 miles in length, making it the 258th longest cave in the United States.

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