DIYARBAKIR, TURKEY - APRIL 10: A drone photo shows the Walls of Diyarbakir, with its length of 6 kilometers, the second largest city walls in the world after the Great Wall of China, in Diyarbakir, Turkey on April 10, 2018. It is situated 100 m. above the valley of River Tigris. Diyarbakir still carries a medieval atmosphere with its walls encircling the city with its almost intact and impressive, 10-12 meters high and 3-5 meters thick, high walls. Omer Yasin Ergin / Anadolu Agency