Situated on a hill about 550 meters above sea level, the Castel del Monte is one of the most celebrated examples of medieval architecture. Commissioned by Frederick II in the 13th century, it was most likely used either as a fortification or a hunting lodge by the emperor and his court. The octagonal plan of the structure is punctuated by eight octagonal towers at each corner and entrances on the eastern and western sides. The design of the Castel del Monte is a harmonious combination of Greco-Roman, Islamic, and Medieval Gothic styles.