As everybody knows, tourism (旅游业) plays an important part in the development of a country, the life of people and so on. It can open our eyes to the outside world, bring us more knowledge, and make us feel good. However, tourism can also lead to pollution and many other problems to places of interest (名胜古迹).

Luckily, "Green Tourism" is now being promoted and developed around the world. As time goes by, people will begin to realize the importance of these places of interest. "Green Tourism" teaches a person to love nature more and to protect it by enjoying its beautiful scenery (风景) and learning more about it. "Green Tourism" is the best kind of tourism as its purpose (目的) is to let people enjoy natural environments including wild plants and animals, and of course the cultures of many places.

Compared with traditional tourism, "Green Tourism" is to learn more about nature and people. Traditionally, people travel around the world to enjoy themselves and pass time pleasantly. But "Green Tourism" are different. The tourists travel because they fall in love with the beauty of the protected areas. They want to make good use of natural resources (资源) but not use them up. For example, they study the animals, the culture and the customs (风俗) or a place so that they can learn more about the history and value (价值) of the area.

 In short, "Green Tourism" has a purpose and a plan, but not to pollute our places of interest.

The Great Wall of China has a history of over two thousand years. It runs from the east  the west in North China. It is about 6, 300 kilometers . It is often . "Ten-Thousand-Li Great Wall". It is one of the "Seven Wonders of the Ancient World".

The Great Wall is  enough for ten men to walk side by side. Horses can also run along it, too. The Great Wall was made  stones and bricks (砖). There are huge stones on each side and on  highest part. But now some sections of it are worn out.

There are tall watchtowers along the Great Wall. Once upon  time, the soldiers kept watching the enemies (敌人) in the watchtowers day and night. They made  on the towers to tell each other when the enemies came.

Nowadays we  use the Great Wall to keep away the enemies any more. It is a famous place of interest to all the people in the world. Every year thousands of people come to visit  from all over the world.