In today's new puzzle we're going to visit the Great Wall of China. If you didn't know, the Great Wall of China is the collective name of a series of fortification systems generally built across the historical northern borders of China. Apart from defense, other purposes of the Great Wall have included border controls, allowing the imposition of duties on goods transported along the Silk Road, regulation or encouragement of trade and the control of immigration and emigration. Before the use of bricks, the Great Wall was mainly built from rammed earth, stones, and wood. During the Ming, however, bricks were heavily used in many areas of the wall, as were materials such as tiles, lime, and stone. Archaeological surveys found that the entire wall with all of its branches measures out to be 21,196 km (13,171 mi). So are you waiting for? Click start, solve this fun new puzzle and see one of the most impressive architectural feats in history.