Most of Xi’an’s historic attractions are contained within a fortification dating back to the Ming dynasty (1368 – 1644). Not only is the age impressive but so is the size. The Xi’an City Wall is rectangular and stretches for 8.5 miles. Encircling it is a moat measuring 59 feet across and 20 feet deep. The stone curtainwall is an incredible 50 to 60 feet wide at the base. This upper platform (parapet) averages more than 40 feet across. In short, you are standing on China’s best city wall and also the largest one in the world. These buildings are two of the 98 ramparts atop the wall. They are positioned 390 feet apart. This was the perfect distance for archers to crossfire at the enemy.