The Great Wall of China is a huge man made feature which stands on the surface of the earth for past 2000 years. This feature is a unique and very attractive feature. One thing to be made clear about the Great Wall of China is that when Neil Armstrong stepped on the moon, he was not able to see this wall as a line on the surface of the earth. But the myth says that it is visible. This wall was actually built some 2000 years back and the main purpose of building this wall was to protect the local area from the invading enemies. There was no natural protection from the enemies from this side where the wall stands today, and the only way to keep the people safe was to erect a wall. Qin Shi Huangdi was the first emperor of China who built this wall. The wall was built during the Qin dynasty. Actually before this wall was built as it stands today, it was in a different shape. The first emperor of China united the whole of China into seven states and tried to fortify the Northern side of China by connecting all four walls of protection which existed at that time. This one wall was built by extending the four already existing walls. The wall acted as a protection form the Huns, and it can also provide help in the form of signals of smoke in case there was an attack.