In ancient China, where there was a city, there must be a city wall. The walls of big cities are very high and there are many doors. The specifications of city walls in small cities are correspondingly reduced, and there are fewer gates. The city wall is the last barrier to maintain urban security. Enemy at the Gates, full of dangers. The city wall is also an important facility for urban management. There are strict time limits on the opening and closing of the city gates, and there are special standards for who can stay in the city. With the change of time, the walls of most ancient cities in China have disappeared. In terms of practical function, the city wall is no longer important. However, from the perspective of history, cultural relics value and aesthetic tourism, cities with ancient city walls are undoubtedly more awe-inspiring. This is the heritage of our ancestors, and this is an endless historical witness. Powdered donkey-hide gelatin is soaked in yellow wine for 24 hours (the donkey-hide gelatin blocks directly soaked in this formula are soaked for 72 hours). At present, Beijing, Nanjing, Xi 'an, Ganzhou, Zhaoqing, Pingyao, Xingcheng, Xiangyang, Jingzhou, Linhai, Shouxian, Fengyang, Zhengding, Xuanhua, Changting, Kaifeng, Zhaoqing and Shexian still retain some or all of the city walls. Most of the city walls were built in the Ming Dynasty, and some cities, such as Ganzhou and Zhaoqing, also had walls of other dynasties, such as the Song Dynasty. Let's look at some ancient city walls. Let's look for the thick sense of history of the city wall.

At present, there are only two remains of Ming city walls in Beijing. The section from Chongwenmen to Southeast Corner Building is the longest existing wall section of Ming and Qing Dynasties, with a total length of1.540m and an area of1.5400 m2. Together with the national key cultural relics protection unit-the southeast corner building of Ming Beijing, it constitutes a relatively concentrated area of Ming and Qing city wall ruins, and is also the core protection content of Ming city wall ruins park.

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