Castle Aulencia

Castle Aulencia stands on a strategic hilltop near Madrid where the Aulencia River meets the Guadarrama River, featuring a distinctive slender tower surrounded by a double wall with six cylindrical towers. Likely built in the 15th century under Alonso Álvarez de Toledo, the castle held importance in Madrid's medieval defensive network and regional feudal hierarchy. Today the structure survives as atmospheric ruins approximately 20 meters high, commanding views of the surrounding landscape. Listed on Hispania Nostra's red list of endangered heritage sites, the castle remains a notable historical landmark accessible to visitors exploring Madrid's lesser-known fortifications.