In the north of China,there lies a 6,700-kilometer-long (4,161-mile-long) ancient wall.Now well-known as the Great Wall of China,it starts at the Jiayuguan Pass of Gansu Province in the west and ends at the Shanhaiguan Pass of Hebei Province in the east.As one of the Eight Wonders in the world,the Great Wall of China has become the symbol of the Chinese nation and its culture.