Castle of Aguilar Monument · Las Omañas, Astorga, León Image of Las Omañas, not of the place itself. A ruined fortress whose origins can be traced in documents of Alfonso III at the end of the 9th century. In the Middle Ages it was the seat of the Mandación de Omaña, the division that organised the government of the Omaña valley. Photo: Rodelar (CC BY-SA 4.0) What to see and do in Las Omañas