Palacio de los Abades de La Oliva Monument · Carcastillo, Zona Media, Navarra A 16th-century manorial palace in Carcastillo, residence of the abbots of the monastery of La Oliva and evidence of the ecclesiastical power the abbey exercised over the town. siglo XVI Photo: Jialxv (CC BY-SA 4.0) What to see and do in Carcastillo