Diyarbakır Fortress is a historic structure located in the city of Diyarbakır, Turkey. It is known for its impressive walls, which stretch over 5.5 kilometers and are made of black basalt stone. The fortress has been a significant military stronghold since ancient times and has witnessed various civilizations, including the Roman, Byzantine, and Ottoman empires. The fortress is recognized as a UNESCO World Heritage Site, highlighting its cultural and historical importance. Visitors can explore its numerous towers, gates, and ancient inscriptions, which reflect the rich history of the region. The fortress offers stunning views of the surrounding landscape and the Tigris River.