Find the adjectiveThe Great Wall of China is not just a long wall, it is a series of fortifications consist of man-made separated walls, trenches, and natural defensive barriers such as hills and rivers. The first construction of the wall during Qin Dynasty use stone, brick, wood and other material to built the wall. After the first construction, The Great Wall has been rebuilt, maintained and enhanced for several times by several dynasty. The best-known and best preserved section was built during the Ming Dynasty.

If you travel to China to see The Great Wall, what you will be visited might be the remain of the wall built by the Ming Dynasty. The length of the wall built by the Ming Dynasty was 8.851,8 kilometers, stretched from Hushan in Liaoning to Jiayuguan Pass in Gansu. The average height of the wall is 23 to 26 feets. We will also see some communication towers along the wall. There are three type of this communication tower, the first was the one built on top of the wall, the second type was built inside the wall, and the third was built separated from the wall to scout the enemy. The wall is becoming shorter day by day because of natural erosion and human activity.​