The mountain range barrier city of ox horn is on Mentougou Wang Ping mountain ridge of the east in the village of fragrant-flowered garlic garden in the town, it is oldest to belong to the west of Beijing The main road of Western Hills Important pass going. Close the place that the city is built in two hillsides and confronted each other, is guarding the honest communications centre.
Ox horn mountain range imprison the city and face west, the structure of bricks and stones, build and build at the mountain stone with the stone directly, by the the intersection of blue brick and certificate, blue and green stone make the leg. The door opening is 7 meters high, it is 9.3 meters deep to be entered, harsh and unreasonable and 4.
3 meters wide, dimension is very great. Closing two sides of stone tablet of the remains near the city, have great significance in studying honest history. September of 2005 was listed in the fifth batch of district protected historic sites of Mentougou District.