The Castellana Caves, a complex of underground cavities of karst origin, of considerable tourist interest, among the most beautiful and spectacular in Italy. The temperature of the internal environments is around 16.5°C. The beauty of the Castellana Caves attracts visitors from all over the world, and since the day they opened to the public, more than 15 million people have walked its underground ways. The visit to the Caves unfolds along a 3 km route: an extraordinary guided excursion, about 70 metres deep, in an astonishing setting, where caves with fantastic names, canyons, deep abysses, fossils, stalactites, stalagmites, concretions with incredible and with surprising colours stimulate the imagination of children and adults. The Castellana Caves are, therefore, in their own right, an unmissable opportunity to admire one of the most surprising natural places in wonderful Puglia.