Great Wall at Mutianyu

Mutianyu (Chinese: 慕田峪; pinyin: Mùtiányù) is a section of the Great Wall of China located in Huairou County 70 km northeast of central Beijing.

The Mutianyu section of the Great Wall is connected with Jiankou in the west and Lianhuachi in the east.

As one of the best-preserved parts of the Great Wall, the Mutianyu section of the Great Wall used to serve as the northern barrier defending the capital and the imperial tombs.

https://en.wikipedia.org/wiki/Mutianyu