Grotte di Castellana, Castellana
Tel: 39 080 499 8211
Concierge.com's insider take:
Inland from Monopoli on the edge of the town of Castellana, this spectacular network of caves, covered in stalagmites and stalactites, were carved by underground streams over many centuries. Hourly tours are the only way to see the caves; the guides point out rock formations that resemble everything from a camel to Milan Cathedral to Michelangelo's statue of Moses. There are two itineraries: a short one of 50 minutes or a complete circuit of two hours, which reaches the Grotta Bianca (White Cave), an extraordinary natural temple of alabaster over 75 yards underground.