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Throughout its history, this watchtower has been used by military orders, Celts, Romans, Arabs, and Christians, all of whom made it a key defensive stronghold thanks to the privileged location of the hill upon which it stands—rising directly above the steep, rugged terrain that begins at the banks of the Tagus River. From the keep, one can view almost the entire national park and many of the inlets formed by the dammed waters of the Tagus River within the Alcántara Reservoir. It contains the Ermita de Monfragüe church