The ruins of San Félix de Oca Monument · Villafranca Montes de Oca, Montes de Oca, Burgos Of the monastery already cited in 863 only the square chevet remains, covered with a dome on pendentives and opened by a horseshoe arch; tradition places here the burial of Count Diego Rodríguez Porcelos. It was declared a monument in 1931. Photo: José Antonio Gil Martínez from Vigo, Spain (CC BY 2.0) What to see and do in Villafranca Montes de Oca