Why isn't Yong Zhengdi buried in the imperial tomb?

Refuting the answer on the first floor, Yongzheng chose the mausoleum site before his death. Whether Yongzheng died of assassination is still inconclusive.

Some researchers believe that the main reason why Yong Zhengdi hid in the Qing Xiling Mausoleum was because of strategic defense, in order to strengthen the military defense in the southwest of Beijing. Because there is an Amethyst Pass in the westernmost part of the Qingling Mausoleum, which is one of the nine famous passes in China. Historically, Zijingguan was the only passage from North China Plain to Xuanhua, Datong and Zhangjiakou in Shanxi. Zijingguan is a very important military town in history, which is the dividing line between the Central Plains and the northern minorities in history.

From the perspective of geomantic omen, the steep peaks such as Yunmeng Mountain and Yongning Mountain in the tomb area of the Western Qing Dynasty are all formed by solid dolomite. These peaks surround the Qing tombs like natural barriers, which is consistent with the desire of the Qing rulers to be as solid as gold and as stable as Mount Tai.