The palace of the Byzantine rulers of the city was built in the northeastern citadel. Today this citadel is dominated by the mosque of Aslan Pasha (1618). The second citadel is located in the southeast part of the castle and is known as Its Kale, i.e. Internal Fortress. In its center where the seraglios of Ali Pasha stood in the 19th century, now stands the Byzantine Museum, the Fetihe Mosque (1795) and the tomb of Ali Pasha.