Huangyaguan is considered to be a miniature of the Great Wall of China. In this section, you can find the stone base built in the Northern Qi Dynasty (550 - 557) and the brick battlements laid in the Ming Dynasty (1368 - 1644). Watchtowers there are either solid or hollow, and have different shapes, including round ones and square ones. Outside, you may see independent outposts a few meters away from each other; inside, there are also ramparts to reinforce the defense system.
Huangyaguan or Huangya Pass ( simplified Chinese : 黄崖关 ; traditional Chinese : 黃崖關 ; pinyin : Huángyáguān ; literally: "Yellow Cliff Pass") is a small section of the Great Wall of China located in the north of Ji County , Tianjin municipality , approximately 78 miles (126 km) north of urban Tianjin city. The site lies on a steep and abrupt mountain ridge.