Sand Cave
Most of the park's caves lie within its hundreds of feet of limestone strata, but atop that limestone sits a layer of sandstone and shale. Sandstone caves can be found in this ridgetop layer, which often lead to greater limestone caverns farther down. In hope of making such a discovery, explorer Floyd Collins entered Sand Cave in 1925 … but never left. His entrapment, and attempted rescue, made headlines across the nation and caused a near-carnival of activity outside the cave entrance. That entrance is visible close at hand from the overlook at the end of Sand Cave Trail. A series of outdoor exhibit panels along the trail explain the historic events. Note: Sand Cave is closed to public entry.