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Venado Caverns is limestone chambers, which extend 2,700 meters and are replete with stalactites, stalagmites, and underground streams, weren't discovered until 1945, when the owner of the farm fell into the hole. The main mouth is on the farm of Julio Solis, reached via a mud-and-gravel road that leads south from Venado uphill to Lake It would take you  two hours exploration of the caverns.