Visiting Xuanwu Lake is a must to explore the city wall. This is the symbol of Nanjing, the capital of Zhu Yuanzhang. The city wall is built by mountains and rivers. It is about 21 kilometers old. It is the largest and most authentic city wall in the world. When you stop at the mound of the city wall and look down at the beautiful scenery of Xuanwu Lake at the foot of Zijin Mountain, it seems that you can see literati poets drinking and chanting here... I can't help sighing that although after hundreds of years of vicissitudes, the city walls are still standing tall, which is really the pride of ancient architecture! Suddenly see the distant wall quietly open Xiaohua, a little orange yellow in the green leaves under the cover, for the meandering Ming City Wall added a touch of witty color...