The acropolis of Bouchetion occupied the flat area on the top of the hill. The Byzantines used the fine masonry of the ancient wall as a foundation and raised their castle using tiles and rough rubble masonry. Most of the walls are overgrown and the castle’s interior is ruined.The only surviving structure is the 15th century church of the Assumption of the Virgin Mary, where the remains of St. Luke the Evangelist were secreted after the Franks conquered Constantinople in 1204. As you enter the church you come face to face with the angels striking the Devil, who is accompanied by wild beasts (bears and wolves) and shepherds the hapless souls of those condemned to eternal damnation.