Watchtower of Torrepedrera Monument · El Berrueco, Sierra Norte, Madrid An Andalusi watchtower built between the 9th and 10th centuries as part of the defensive system of the Middle March, whose centre lay at Talamanca del Jarama; from its hilltop it linked up with the watchtowers of Arrebatacapas, Venturada and El Vellón. Photo: Rowanwindwhistler (CC BY-SA 3.0) What to see and do in El Berrueco