Monastery of San Juan de la Hoz Monument · Cillaperlata, Las Merindades, Burgos Image of Cillaperlata, not of the place itself. Ruins of one of the oldest monasteries documented in the lands of the county of Castile, situated in a gorge of the sierra de la Llana a little more than a kilometre from the town. The plan of the church is preserved, with a semicircular apse, and remains of columns and corbels. Photo: Maragm (CC BY-SA 3.0) What to see and do in Cillaperlata