Xi 'an Ancient City Wall is not only the best preserved ancient city wall building in China, but also the largest and most complete ancient military castle facility in the world. Xi 'an City Wall was built in Hongwunian of Ming Dynasty (1370- 1378). It was formed on the basis of the wall of the Sui and Tang Dynasties in the 6th century A.D., with a perimeter of 139 1m, a wall height of 12m, a bottom width of 18m and a top width of 15m. The ancient city wall provides us with rare physical materials for studying the history, military affairs and architecture of the Ming Dynasty.
Second, Xingcheng Ancient City
It was called Ningyuan Acropolis in Ming Dynasty and Ningyuan House in Qing Dynasty. It is one of the four best-preserved ancient cities in Ming Dynasty in China. The ancient city was built in the fifth year of Xuande in the Ming Dynasty (1430) and is square. The city wall is made of blue bricks and stones. It is 826 meters long from north to south, 804 meters wide from east to west, 5 meters at the top, 6.5 meters at the bottom, 10 meters high and 3,260 meters in circumference. There are gates on all sides of the city, corner platforms on all four corners, and Kuixing Tower on the southeast corner platform. East-West Street and North-South Street intersect in the city, and the bell and drum towers set each other off. The whole ancient city building maintains the Ming and Qing styles. The ancient city was an important defensive town outside Shanhaiguan in the late Ming Dynasty. In the history of Ming and Qing Dynasties, General Amin Yuan Chonghuan seriously injured Nuerhachi of Qing Taizong, and later defeated Huang Taiji of Qing Taizong in May of the seventh year of the Apocalypse, calling it "Ningyuan Victory".
Third, Pingyao Ancient City
Pingyao Ancient City is the most intact county seat of Ming and Qing Dynasties in People's Republic of China (PRC). It is a typical representative of the ancient county town of Han nationality in Central Plains of China. Due to the establishment of the county seat, in the third year of Qing Daoguang (1823), the first draft bank "Rishengchang" was born in Pingyao Ancient City. The establishment of Rishengchang is of epoch-making significance in China's ancient and modern financial history. It marks the emergence of a new type of financial industry in the late feudal society of China.
Up to now, the walls, streets, houses, shops, temples and other buildings are still basically intact, and the original architectural pattern and style remain basically unchanged. Most of the treasures in the ancient buildings in the city and its suburbs are well preserved. They are an organic part of the existing historical relics in Pingyao ancient city, and they are all living specimens for studying the historical development of China's politics, economy, culture, military, architecture, art and so on.
Fourth, Langzhong Ancient City
The geographical environment, urban site selection and architectural layout of Langzhong ancient city are deeply related to the traditional geomantic theory. The integration of mountains, water and cities typically reflects the style of ancient urban construction and shows a strong traditional cultural color. Langzhong got its name, symbolizing the landscape pattern. The ancient city is located at the intersection of Daba Mountain System, Jianmen Mountain System and Jialing River System, surrounded by mountains and water, forming a place where mountains and rivers closely cooperate, and the seven customs (Nanjin, Wuji, Hexi, Liangshan, Zhaoshan, Land and Didi) are protected together to form a golden soup. Panlong Mountain is the town mountain behind the ancient city, Jinping Mountain is the case mountain in front, Jin 'er and Yin are opposite mountains, and the surrounding mountains are sand mountains. Jialing River is surrounded by the city on three sides, forming a trend of "low water becomes a wall" and "surrounded by a golden city", with Yutai Mountain as the Tianmen at the mouth of the sea and Tashan and Daxiangshan as local households. Under the Phoenix Mountain in the city is the main cave, and Jianzhou and the government office face Jinping in the south. The street is centered on Zhongtian Building (Sipailou) and radiates from east to west and north and south, which should be regarded as "ten roads in the sky"; Regardless of the orientation, Henghengfan always faces the distant mountains, and the streets are named according to the orientation, emphasizing the theme of Feng Shui. In the east of the city, south of the city, and at the King Gate of the Tiger Wall, tall buildings are built on it every month to receive the effect of welcoming music and receiving water. But it is more difficult for Ximen to meet mountains and water. There are stone pavilions, Wangye Temple, Range Rover Mountain House and Langfeng Pavilion outside the city gate, instead of the Moon City. Jianhua Guanglou faces Lianfeng Building and Kuixing Building in Nanjinguan across the bank, filling the gap between Jinping Mountain and Huanghua Mountain. The industrial and commercial city and the land and water post hub are located in the southeast area outside the city to avoid noise.
There are all kinds of macro-worship buildings outside the city, such as Lv Zu Temple, Du Shaoling Temple, White Pagoda, Big Buddha Temple, Star Terrace, Wang Tengting and Yutai Temple. These buildings all gather mountain gods, which is helpful to enlighten the humanities.
The site selection, layout, style and management development of Langzhong city typically reflect the planning concept and practice of China's ancient urban construction, especially the geomantic theory, which has accumulated rich traditional cultural characteristics. Although superstitious, it also contains scientific and aesthetic elements. At present, the scientific and technological circles at home and abroad agree that the ancient city of Langzhong is the best preserved ideal city in the contemporary era, which was built in full accordance with the astronomical geomantic theory of the Tang Dynasty.