City WallThe City Wall, constructed in the early Ming Dynasty on the basis of the Imperial City of Chang An (Everlasting Peace) of the Tang DynastyIt, is also a symbol of great significance of the famous historic cultural city of Xian. The construction of the Xian City was formally started in the seventh year of Emperor Hongwu's reign (1374) and completed in the eleventh year of Hongwu's reign (1378). After its completion, the circumference of the city wall was 13.75 kilometers long in an oblong shape. Its height is 12 meters; its top is 12-14 meters wide and its base, 15-18 meters wide. It has been preserved intact for such a long time, which is rarely seen in the world.