The Wall we see today is but one tenth of the total length of the walls ever constructed over succeeding dynasties of China. The best preserved sections refer to the wall built during the Ming Dynasty (1368-1644), from Shanhaiguan in the east to Jiayuguan in the west. Approximately 5,130 km (3,188 miles) in length, the Ming Wall was built under the most difficult conditions, across some of the…