Just to the north of Ashyk Aydyn Pir, and visible from the side road leading to it, stands the ruined fortress of Diyarbekir.
Rectangular in plan, the medieval walls preserve semicircular towers and battlements. The walls of one interior building are still standing, and the ground inside the fortress is studded with so many fragments of brick as to take on a reddish hue. Diyarbekir is believed to have been first settled as early as the 4th century BC. It was later abandoned, but seems to have been resettled around the 10thcentury, before being abandoned for good by the 15th.