Xian City Wall is the best-preserved ancient city wall in China and also the largest and most complete military facility in the world.
After its enlargement in the Ming Dynasty, the City Wall now stands 12 meters (40 feet) high, 12-14 meters (40-46feet) wide at the top and 15-18 meters (50-60feet) thick at the bottom. It covers 13.7 kilometers (8.5 miles) in length with a deep moat surrounding it. Every 120 meters, there is a rampart extending out from the main wall. The distance between the ramparts is within the range of an arrow shot from either side. There are altogether 98 ramparts; each has a sentry building on top of it.
Cycling is the best way to explore the historic city walls of Xi’an. The South Gate and North Gate are the two main entrances to the inner city. Enter the wall via the South Gate which is the most impressive one of the four main gates, the bike hire place is on top of the wall near the South Gate Tower. It’s amazing when biking atop the old City Wall and enjoying a great view of the city.