Wikipedia
Guang'anmen , also known as Guangningmen , Zhangyimen (张仪门 or 彰仪门) was a city gate of old Beijing, constructed during the reign of Jiajing Emperor (1521–1567), Ming Dynasty. This gate was part of Beijing's city wall, situated south-west of the city center and faced east. Guang'anmen served as a main entrance to Beijing. Yanjingji , records written by the famous Qing historian Gusen , described the gate as follows: Of the seven outer city gates, the one facing east is called Guangningmen. 15km to the west of the gate is Lugou bridge, if you cross the bridge and continue 20km, you will find Liangxiang county. The gate is a strategic passage for ground traffic from Southern provinces and is of vital importance .
The gate was torn down for construction of Beijing's second ringroad, which led to the demolition of most of Beijing city fortifications. The original two-story tower with double eaves was 17.6m tall, 13.8m long and 6m wide. The tower and the wall combined had a height of 26m.