The Great Wall of China is one of the greatest (wonder) of the world. In 1987, it (list) as a world cultural heritage（世界文化遗迹）by UNESCO. The Great Wall winds up and down across deserts, and mountains, covering about 6,700 kilometers the east to the west of China.
In ancient China, many people built walls around their countries (protect) their land. Later, Qinshihuang, the emperor of the Qin Dynasty, had the walls joined up. project cost much money and thousands of people lost (they) lives because of hard work. On top of it, it is wide enough for five horses or ten men to walk side by side. Along the wall are watchtowers, where soldiers (use) to keep watch. Now it is one of the (famous) places around the world. More and more tourists have come to know the famous Chinese saying — "He does not reach the Great Wall is not a true man." People still wonder the ancient Chinese people built the wall without modern machines.
