Alcalat Castle, locally known as Castillo de Alcalat, lies in the center of the village of Espejo in the province of Córdoba in Spain.
Alcalat Castle, a medieval castle in Gothic style, was built in the 14th century by a powerful Christian nobleman; Pay Arias de Castro. The village grew up around the castle.
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The castle has a quadrangular ground plan with 4 towers at its corners and a central keep, called Torre del Caballero; the Knight's Tower.