The Great Wall, symbolizing China's ancient civilization, known as one of the 7 great wonders in the world, is the only man-made project on earth that is visible to the naked-eyes of astronauts. It extends more than 300 kilometers from end to end, and with its mea-derings and loops the full extent of the project measures nearly 6000 kilometers. According to rough calculation, the amount of bricks and rock used to build the wall would have been enough to build a wall 5 meters high and 1 meter thick around the world.

It was first built in Warring States Period (476-221B.C.) by various conflicting states along their borders for protecting against each other. In 221 B.C., The first emperor in Chinese history, Qingshihuang united the 7 states as one and issued an order to reinforce and linked together the walls originally built by the other states. Historical records show that about 1 million people,1/5th of China's population at the time, were involved in the project which took more than 10 years. It was called "Wan Li Chang Cheng" at the time when it finished,which means "10 Thousand-Li-Long-Wall". From then on the Great Wall played a significant role in protecting the economic and cultural developments in the central plain area of China.

It is listed by the Chinese Government as one of the historical monuments to be preserved.

Badaling Section -It is the most famous section in Beijing which built more than 600 years ago during the Ming Dynasty. This section is some 70km away to downtown Beijing by superhighway and it is the closest section of the Great Wall to Beijing which can be visited in a half day. Great Wall at Badadling section was completely restored after 1957.
Mutianyu Section - This section is located some 90km north of Beijing, and like Badaling section, it is recently completed it renovation and it is very popular to tourists. There is chairlift available at Mutianyu. Once on the top of the Mutianyu section of the Wall, the views of the Wall undulating down wooded canyons and up the mountain ridges are breathtaking.
Simatai Section - This section is some 110km northewest to Beijing and it is a dramatic testimony to Ming engineering skills with one section as steep as 85 degrees. Just partially restored, this section allows athnic visitors who climb past the first watchtowers to see the Wall in its wild, crumbling state.
Jinshanling Sectionl - Hebei Province takes pride in owning the longest, best preserved and most representative part of the Wall in China. The Jinshanling section was first built in the 6th century and there are 67 watchtowers, all in different styles along the section.
Huangyaguan Section - Located 20km north of Jixian county of Tianjin, this section was an important fort of North Great Wall in Ming Dynasty. The Wall here was first built in 556 on top of the mountain ridge, then covered up with bricks on the surface in 1567 to 1572. Known as "Mt Huangya of thousands of pagodas", this section has many pagodas as well as dozens of grandiose watchtowers set up by Qi Ji-guang, chief commander of Ji Defense.
Shanhaiguan Section - Located 25km northeast of Qinhuangdao, this section is the east timinal of Great Wall, a vital fort and was a military must in all times. First built in 1381, with the mountain behind and the sea in front. The fort leans on the mountain and take advantage of the topography, and reputed as very intergrated to be an Iron pass and golden lock of Great Wall http://www.sinotour.com.cn/China-Guide/great_wall.asp.