www.inspain.org
A sort of military fortress located next to the Tajo River and built in order to defend the Alcántara Bridge.
It was originally built as a monastery and was ordered by Alfonso VI in 1088 in honour of the Saints Servando and Germano.
It was rebuilt as a result of the reconquest of the town in the XI Century, due to the threat to the Christian Kingdom and the possible Muslims entry through the Alcántara Bridge.
It has a rectangular floor with cylindrical and empty towers on three of its corners with horseshoe arches, and an intermediate one on the Southern face. The windows of the machicolations of the tower are built with brick and have a polilobed shape. The main door, toward the town, is opened in a sort of Albarran tower.
Nowadays it is totally restored and works as hall of residence.
You can only visit the exterior of the monument.