The inner castle of Diyarbakır's old town is a circular fortress that once held the city's palace and other important buildings. Today the most notable landmark is the 16th-century Hazreti Süleymaniye Cami, which contains the grave of the son of Khalid ibn al-Walid, the companion of the prophet Muhammad, who died during the city's capture. It has a tall, graceful minaret and is striped with black basalt and pale sandstone, a favorite design of this city's medieval
architects. Its courtyard fountain is fed by an underground spring that has supplied cold, clear water to the city for 5,000 years. The area is the focus of a major restoration and rejuvenation project.
İzzet Paşa Cad., Diyarbakır, Turkey