Monte Kronio, Archaeological mountain reserve in Sciacca, Italy

Monte Kronio, also called Monte San Calogero, is a limestone hill rising 395.48 metres about 7 km from Sciacca. Its karst complex includes the Stufa di San Calogero, a cave 9.4 metres long, 4.2 metres wide and about 4 metres high, where sulphur vapours keep temperatures between 36 and 42 °C. The hill also holds the 16th-century Sanctuary of San Calogero and the Antiquarium di Monte Kronio.

Copper Age jars from the fourth millennium BC, found in a cave in 2012, held tartaric acid and its salt, evidence of winemaking 6000 years ago. In 1880 Silvestro Zinno surveyed the caves for Sciacca's council, which then proposed a spa. The sanctuary was built in 1530, entrusted to the Third Order Regular of St. Francis in 1948 and raised to minor basilica by John Paul II in 1979.

The sanctuary, built in 1530, has been run by the Third Order Regular of St. Francis since 1948 and was raised to minor basilica by John Paul II in 1979. Inside is a statue of Saint Calogero carved by Antonello Gagini. The mountain's other name, Monte Kronio, comes from the Greek god Cronus, who was said to live here.

The caves lie about 7 km from Sciacca, within a nature reserve run by the Sicilian regional forestry agency. Inside the Stufa di San Calogero the air stays between 36 and 42 °C depending on season and time of day, so plan a short stay and carry water. The Antiquarium, opened in the 1980s, is managed by the Soprintendenza of Agrigento.

In 2017, Copper Age pottery was found in the sulphur caves, including a jar holding traces of wine dated to about 6000 years ago, considered the oldest wine in Italy. The same caves were carved in antiquity with benches and holes for inserting aching limbs.