Historic ensemble of Castropol Monument · Castropol, Eo-Navia, Asturias The town looks out over the Eo estuary from a promontory, with cobbled streets, whitewashed houses and indianos' mansions gathered around the church of Santiago; the ensemble has been listed as a Bien de Interés Cultural (Spain's highest level of heritage protection) since 2004. Photo: Trubieco (CC BY-SA 4.0) What to see and do in Castropol