Palace of Mon Monument · San Martín de Oscos, Eo-Navia, Asturias Baroque palace complex of the 18th century, with an irregular floor plan around a courtyard and a south façade between two square towers covered with coats of arms, gargoyles and balconies; it was declared a Bien de Interés Cultural (Spain's highest level of heritage protection) in July 2006. In this family palace, Romualdo Mon y Velarde was born in 1749, son of the lords of the houses of Mon and Valledor, who would go on to become archbishop of Tarragona between 1803 and 1816 and archbishop of Seville from 1816 until his death in 1819. Photo: Drella (CC BY 3.0) What to see and do in San Martín de Oscos