They narrate dramatic tales of the history of the caves and the legends associated with them in Telugu, English, Hindi, Bengali and Oriya. The caves were discovered by British geologist William King when he was on one of his expeditions in 1807. These caves are believed to be over 150 million years old. They were carved out by small streams that flow into the Gosthani River. Humic acid in the water reacted with the calcium carbonate in limestone of the hills, which  gradually broke down the rocks. Anthropologists found tools made of stone, belonging to the Middle Paleolithic Age (30,000-50,000 years ago), indicating human habitation in the surrounding areas.