Tower of Puebla de Lillo Monument · Puebla de Lillo, La Montaña de Riaño, León A fourteenth-century cylindrical tower with an internal diameter of eight metres that served in turn as watchtower, jail and town hall, and which remains the most recognisable building in the town centre. Photo: acebal (CC BY 2.0) What to see and do in Puebla de Lillo