"Fossa Maiura", a gigantic chasm already mentioned in ancient times ("description of Alvito et his Contato" Prudentio 1574) in the texts of historians and naturalists, for its geological and naturalistic peculiarities. The area still remains an example of integration between human activities (agricultural and pastoral) and natural balances, despite the relentless process of land abandonment, now revealing the testimony of an almost lost era. A few kilometers from the village of Alvito, in the mountains bordering Abruzzo, there is the so-called Fossa Maiura (815 m), a karst depression that almost forms a natural amphitheater: it is a gigantic sinkhole about 100 meters deep and about 3 km in circumference, in the shape of an inverted truncated cone that has a perimeter greater than a kilometer. Here the feeding waters of the Fibreno originate. Within the territory there is a spring from which sulphurous-ferruginous water flows. This very particular karst depression with the ancient districts of Cortignale and Cappudine, now abandoned, present themselves as real ghost towns. The two villages were completely depopulated already after the war, but within the walls of the stone houses you can still understand the customs and rules of the disappeared peasant civilization.