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The Torre del Oro is what's known as a dodecagonal (twelve-sided polygon) military watchtower, located in Seville, southern Spain.
It was built by the Almohad Caliphate to control access to Seville via the Guadalquivir river. It was erected in the early 13th century, and the tower has seen some real historical action over the years. It even served as a prison during the Middle Ages.