I found the opportunity to visit this site thanks to an offer of an excursion suggested to me by some friends, which I enthusiastically accepted. That day, when we arrived at the site, we were welcomed by the people in charge of attending to the hikers, and after giving us a talk about the general characteristics of the place, they guided us to the first point of interest of the site: the Cueva de los Pájaros (Birds' Cave). This cave is a natural cavity open to the sea, wide, in whose roof a great number of swallows nest. It is elaborated by natural processes in ancient limestone rocks, as a result of the dissolution of the same by slightly acidified waters, in a process of dissolution of carbonate rocks.