The largest and most functional ancient military post station in existence.

Where is the largest and most functional ancient military post station in existence, and the world's earliest post office? With these questions and curiosity, let's talk about the stories of Jiming Post today. Jiming Post, also known as Jiming Mountain Post, is located at the foot of Jiming Mountain on the north bank of the Yanghe River in the northwest of Huailai County, Zhangjiakou City, Hebei Province. In 2001, it was announced by the State Council as a national key cultural relics protection unit. The post was named after the mountain, and the city was named after the post. According to experts, Jiming Post is the largest and most functional ancient post station in existence. Jiming Post was built in the Yuan Dynasty. In 1219, Genghis Khan led his troops to the west, and a post road was opened on the avenue leading to the west city, and a "station red" was set up, that is, a post station. In the 18th year of Yongle in the Ming Dynasty (1420 AD), Jiming Post was expanded into the first major station for the Beijing Division of Dinghuo Prefecture. During the Kangxi period of the Qing Dynasty, a post official was set up to manage the post station affairs. Jiming Post was built with a rammed earth wall in the eighth year of Chenghua in the Ming Dynasty (1472 AD), and a brick city wall was built in the fourth year of Longqing (1570 AD). The city has a circumference of 2,330 meters and a wall height of 12 meters. There are two gates in the east and west. There are two floors of Yue Tower above the city gate. The Jade Emperor Pavilion is built in the middle of the city, and corner towers are built in the four corners of the city.