Castle of los Mendoza de Buitrago Monument · Buitrago del Lozoya, Sierra Norte, Madrid 15th-century alcázar in Gothic-Mudéjar style, built with brick, lime and masonry, with a rectangular plan, central courtyard and seven towers, among them the pentagonal one that defends the entrance; it is integrated into the town's wall. Photo: 19Tarrestnom65 (CC BY-SA 4.0) What to see and do in Buitrago del Lozoya