This is nothing more than an underground cistern dug entirely by hand, in which water was collected for the city. The signs of wear left by the buckets that carried the water to the surface are visible on the walls. You will be able to enter inside thanks to a system of walkways that will show you the impressive size of this excavation. The visit lasts about 15 minutes and it is possible to buy tickets on site for € 3.00. In high season it is preferable to book the visit before departure