Introduction to Tianzhu Pass: Tianzhu Pass was an important passage from Lingchuan to Huixian in ancient times. It is sandwiched between two peaks (Tianzhu Twin Peaks) and a small trail in the middle. There is an artificial stone gate between the two peaks, more than 2 meters high and 1.6 meters wide. There is a door bolt hole in the door wall. It can fit a wooden door bolt with a diameter of 10 cm, and there are two smooth round door hinges under the door. The upper left and right sides of the stone wall of the door frame are engraved with the two characters "mountain" and "men", and the four characters "Jin-Bian Throat" are engraved on the forehead of the door. This was inscribed by Du Yongsi, a native of Lingchuan who was the magistrate of Xinxiang County, Henan Province in the Ming Dynasty. Inscriptions from the Ming Dynasty record the reasons for the fortification and the list of garrison commanders.