The climb to the peak of San Millán Activity · Pradoluengo, Montes de Oca, Burgos Image of Pradoluengo, not of the place itself. From the village start circular routes towards San Millán, at 2,131 metres the highest summit of the province of Burgos, also known as El Torruco. The ascent crosses beech and oak woods of the Sierra de la Demanda. Photo: Mhh1001 (CC BY-SA 4.0) What to see and do in Pradoluengo