Church of Santa Eulalia de Posada de Valdeón Monument · Posada de Valdeón, La Montaña de Riaño, León Image of Posada de Valdeón, not of the place itself. The valley's parish church is documented since 1098 and is the religious head of the seven villages of Valdeón, a council that remained enclosed between the massifs of the national park until the modern roads were opened. Photo: Alvaro Ortiz from Madrid, Spain (CC BY-SA 2.0) What to see and do in Posada de Valdeón