The northwest corner is low-lying and feng shui.

Beijing is a famous cultural ancient capital of China. Many feudal dynasties in history established their capitals here, such as Ming Dynasty and Qing Dynasty. These feudal dynasties left us many ancient buildings, which were well preserved, such as the Forbidden City and the ancient city walls around Beijing.

Speaking of the ancient city wall in Beijing, it can be said that it has a very long history. Their circumference is 60 miles long, the wall base is 24 meters wide and the overall height is 8 meters. They are rammed earth walls made of steel plates. I don't know if it is clear to everyone that the ancient city wall built in Ming Dynasty in Beijing has no northwest corner, so why?

There are several speculations about why there is no northwest corner of the Ming City Wall in Beijing.

First, this is what Yao did at that time. When he seized the throne from his nephew, he began to order Yao to build Gyeonggi. For Beijing, the main task is to rebuild and repair the city walls left by the previous dynasty. At first, Yao was designed according to the rectangle, and the idea was to establish the diagonal intersection of the rectangle in the Golden Jubilee of the Forbidden City, but due to natural irreversible reasons, he finally deviated from this design.

This is unacceptable for the concept of the supremacy of imperial power. In order to ensure that the intersection point, that is, the center of Beijing is still in the Golden Palace, Yao demolished the wall in the northwest corner.

The second guess is that the wall in the northwest corner collapsed repeatedly in the process of rebuilding the Beijing wall at that time, and the construction work could not be completed at all. In ancient times, there was a saying that Zhoushan Mountain was not built in time, the sky collapsed in the northwest and the ground sank in the southeast, so Yao and others moved the city wall inward. Sure enough, the city wall no longer collapsed, which is the oblique angle we see today.

The third guess is feudal superstition. In ancient times, people thought that the sky was supported by eight mountains, among which the mountain supporting the northwest was Buzhou Mountain, and the wind blowing from the northwest was also called "unhealthy wind". Ban Gu in the Eastern Han Dynasty explained that "thoughtlessness" meant not paying money, so Yao and others deliberately vacated this place.