I make a quick stop at Mammoth caves, with more then 600 kilometers of passageways, the largest cave system in the world. But more interesting for the visitor, the landscape above the cave is a karst topography, an eroded limestone landscape with a sandstone caprock. And that can mean only one thing inside the caves: Stalagmites, Stalactites and Columns. Oh and very touristy and busy and all that.
Dag,
Iris (Mammoth Cave NP, 27424 miles)
