Great Wall

 

The construction of the Great Wall started from 7th century BC, therefore, it had a history of more than 2,500 years. It starts from Shanhaiguan Pass, a seaport along the coast of Bohai Bay in the east, to Jiayuguan Pass in Gansu Province in the west, covering 16 provinces, cities and autonomous regions in China. It is more than 6,000 km long.
 
The purpose of building the wall was to prevent the frontier from the invasion of the northern nomadic tribes. The Great Wall traverses many mountains and gullies, a countless number of inner walls, outer walls, fortified towers, signal beacon towers, fortifications and garrisons complete this complex, and make up the whole system of the Great Wall.
 
In Beijing, the Great Wall is 629 km long; five sections of the Great Wall have been opened to visitors. There are Badaling Section, Simatai Section, Mutianyu Section, Jinshanling Section and Gubeikou Section. Of all these five sections, the Great Wall at Badaling Section is the most famous and best preserved.