Atburgazı Castle, located in the Atburgazı neighborhood of Söke district in Aydın, is a Byzantine-era castle ruin. Constructed with rubble stone, the castle served as a watchpoint to control the road between the ancient cities of Priene, Miletus, and Didyma. The castle is situated in a commanding position overlooking the Büyük Menderes Delta and the Söke Plain.