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This book mainly refers to the thousand-year-old city walls and ancient city gates. Including Ming and Qing city wall combinations Nanjing Ming and Qing City Wall, Xi'an Ming and Qing City Wall, Xiangyang Ming and Qing City Wall, Jingzhou Ming and Qing City Wall, Xingcheng Ming and Qing City Wall, Linhai Ming and Qing City Wall, Shouxian Ming and Qing City Wall, Fengyang Ming and Qing City Wall, Shangqiu Ancient city wall, Kaifeng ancient city wall, Beijing ancient city gate (nine inner gates: Zhengyang Gate, Chongwen Gate, Anding Gate, Xuanwu Gate, Desheng Gate, Dongzhimen, Xizhimen, Chaoyang Gate, Fucheng Gate; seven outer gates: Guangqumen, Guangqumen, Anmen, Zuo'anmen, You'anmen, Dongbianmen, Xibianmen and Yongdingmen are the four gates of the Imperial City: Tiananmen, Di'anmen, Dong'anmen, Xi'an Gate, Nanjing Ancient City Gate (Nanjing Xuanwu Gate, Nanjing Zhonghua Gate), Xi'an Ancient City. Gate (Xi'an Shangwu Gate, Xi'an Zhuque Gate), Hangzhou Ancient City Gate (Hangzhou Wulin Gate, Hangzhou Wangjiang Gate, Hangzhou Qiantang Gate), Luoyang Ancient City Gate (Luoyang Lijing Gate, Luoyang Dingding Gate), Kaifeng Daliang Gate, Jingzhou Nanji Gate, etc.