Castel del Monte (Italian for "Castle of the Mountain"; Barese: Castìdde du Monte) is a 13th-century citadel and castle situated on a hill in Andria in the Apulia region of southeast Italy. It was built during the 1240s by King Frederick II, who had inherited the lands from his mother Constance of Sicily. In the 18th century, the castle's interior marbles and remaining furnishings were removed. It has neither a moat nor a drawbridge and some considered it never to have been intended as a defensive fortress. However, archaeological work has suggested that it originally had a curtain wall. Described by the Enciclopedia Italiana as "the most fascinating castle built by Frederick II", the site is protected as a World Heritage Site. It also appears on the Italian version of the one cent Euro coin. Location Castel del Monte is situated on a small hill close to the monastery of Santa Maria del Monte, at an altitude of 540 m. When the castle was built, the region was famously fertile with a plentiful supply of water and lush vegetation. It lies in the comune of Andria, province of Barletta-Andria-Trani, occupying the site of an earlier fortress of which no structural remains exist. The castle's construction is mentioned in only one contemporary source, a document dating to 1240, in which Frederick II ordered the governor of Capitanata to finish some works in it. It was never finished and there is no proof that the he used it as a hunting lodge as commonly stated. It was later turned into a prison, used as a refuge during a plague, and finally fell into disrepair. It originally had marble walls and columns, but all were stripped by vandals or re-used in constructions nearby. Description Because of its relatively small size, it was once considered to be no more than a "hunting lodge", but scholars now believe it originally had a curtain wall and did serve as a citadel. Frederick was responsible for the construction of many castles in Apulia, but Castel del Monte's geometric design was unique. The fortress is an octagonal prism with an octagonal tower at each corner. The towers were originally some 5 m higher than now, and they should perhaps include a third floor. Both floors have eight rooms and an eight-sided courtyard occupies the castle's centre. Each of the main rooms has vaulted ceilings. Three of the corner