Great Harmony Gu Chenyun is medium, smooth city, ever was capital of Northen Wei Dynasty, distant, gold is accompanied, churchyard historic site is numerous, well-known cultural relic place of historic interest includes Yun Gang grotto, China Yan Si, be apt to changes temple, Heng Shan wall of impending temple, 9 dragon. Great Harmony is one of base of China's largest coal energy resources, the country weighs base of chemical the sources of energy, the midpoint of division of burgeoning energy of Er of divine government office, standard pattern and industrial district of Beijing ferry Tang Fada. Element has " phoenix city " and " Chinese coal " say. Great Harmony ancient city wall is located in region of Great Harmony downtown, ancient city area 3.45 square kilometer, outline shows a square. Existent city wall is bright generation imperatorial Xu Da is in Chinese, the Kingdom of Wei, the Tang Dynasty, distant, gold, yuan Wu Wunian of the Yu Minghong on old city base (the Christian era 1372) add build rise. The city wall is 14 meters tall, go up 12 meters wide, below 18 meters wide, circumference 7.2 kilometers, build have advocate city gate 4, door of Dong Yuehe open door, Na Yueyong peaceful, Xi Yueqing far door, north says fierce decides the door. Still build at the same time have building of moat, suspension bridge, a tower over a city gate, an embrasured watchtower over a city gate, month, watchtower, a watchtower at a corner of a city wall, accuse army stage to wait for a series of military affairs establishment. Great Harmony ancient city wall is our country existent a relatively whole ancient time structure citying wall. Ancient city wall and moat and park of around the city already became Great Harmony nowadays this chiliad ancient capital shines together beautiful scenery. Because it holds very significant position in upper frontier defence, main effect was produced in fighting for many times. Accordingly, enjoy all the time " imposing town of military importance " , "Northward key " praise.