Mt. Kronio is famous for the complex architecture of its hypogeum in which air and vapors linked to thermal phenomena circulate. The temperature, stabilizing on average around the 38°C, is sometimes so high that it prevents from the complete exploration of the site. In the entangled development of the cavities, you can distinguish five main caves: Stufe di San Calogero, Grotta del Lebbroso, Grotta di Mastro, Grotta del Gallo, and Grotta di Cucchiara. The latter is a real labyrinth. If you love speleology, you will find extremely interesting observation cues. The hydromineral heritage of Mt. Kronio, which is not entirely exploited, is one of the richest and most complete in the world.