China, one of the cradles of human civilization, possesses so many treasures with Chinese characteristics that numerous foreign friends come to visit her. The first place to go to is, the Great Wall, which is the symbol of China and one of the seven wonders in the world. What's more, it is said to be the only construction that can be seen from the outer space. In the imperial periods, it was used in defense of the dynasties. Since liberation, it has become a place of interest