Palace of los Piñán de Cueto Luengo Monument · Oseja de Sajambre, La Montaña de Riaño, León Image of Oseja de Sajambre, not of the place itself. A rural manor house raised between 1621 and 1639, the oldest civil building preserved in the Sajambre valley; to it were added the Casa del Conde, of the fifteenth century, and La Torre, of the late fourteenth. Photo: Modesto Pérez (Public domain) What to see and do in Oseja de Sajambre