On the left side of the high valley of Cesano, there is Serra Sant'Abbondio, near the border with Umbria. It's a small medieval village, with a very suggestive center. The most important and unmissable event of Serra Sant'Abbondio is the Palio della Rocca, a historical commemoration that includes a challenge between the 3 ancient villages.
Founded in the tenth century on the wooded slopes of Mount Catria, some hermits decided to build a Camaldolese Benedictine hermitage and monastery.