The Jiayuguan tower over a city gate, located at the Gansu Province Jiayuguan southwest 7 kilometers place, is the Great Wall west end end point. Jiayuguan constructs in the bright Hongwu five years, therefore because of city in the Jiayu foothill, since old times for the military important place. Entire Guan Cheng constructs firmly grand, with overpowering momentum, Guan Cheng assumes the trapezoid, the perimeter 733 meters, the area 33500 square meters, the height 10 meters, piles up the wall height 1.7 meters, the thing city wall opens the door, the tower over a city gate is symmetrical, three five types, the surroundings have the porch, the city four corners have the watchtower, the north and south wall center-section have the watch tower. Two in north side have training ground Dacheng to go against. Center Guan Cheng has an official well. West side the city wall protrudes, middle opens the door, the top of lintel engraves “Jiayuguan” three characters. The original tower over a city gate, is the same with the thing two building constructions, three building things become one. The what people say constructed in the past when closed, the master craftsman computation needed materials are very precise, after the completion, only remained a brick. After west this brick saves the enceinte of city gate gate tower, now above eave Taiwan. Outside the west gate 1 mile place has the stele, on engraves “the world strategic pass” four characters; East outside the enceinte of city gate has the Wenchang Chinese style pavilion, the temple to Guanyu, the stage platform, in the city has guerrilla yamen government office one depending on the north, is the Qing Dynasty constructs.