Embedded in the rock walls are thousands of fossil and bone deposits dating back over one million years. A paleontologist's wonderland with mammal fossils from extinct worlds, one of the reasons for the international significance. Encountering these caves via a restored WW1 mine shaft offers insight into the discovery of natural resources in the early twentieth century. Low level of fitness required. Wheelchair and pram accessible. Enclosed footwear is essential and hard hats provided must be worn. ​ Duration one hour.