At 8 km from the city you can visit one of the largest sinkholes in Europe: the Pulo. It is a huge depression in the ground in the shape of a funnel, due to the collapse of an immense subterranean cavity arranged on different levels. Its dimensions are truly stunning with its 90 m deep and its 550 m in maximum diameter and 450 m in the minimum diameter, given its elliptical shape. On its walls there are remarkable caves, inhabited in prehistoric times and then re-used by shepherds as shelters for herds.