The most famous ancient buildings in the 21 countries represent their respective national customs

 1. China the Great Wall the Great Wall, also called the Great Wall, is Chinese ancient military defense project, is a tall, strong and without stop in Changyuan, in order to limit every enemy riding action. The Great Wall is not a simple and isolated city wall, but a defense system based on a city wall, with a large number of cities, barriers, pavilions and signs. The history of the the Great Wall can be traced back to the Western Zhou Dynasty, and the allusions of the "beacon fire dramas" originated from this. During the spring and Autumn period and the Warring States period, the countries were fighting for hegemony and defending each other, and the construction of the Great Wall entered the first climax. The Qin Dynasty unified the world, the connection and repair of the Warring States beginning with the Great Wall, the Great Wall said.