The Great Wall of China is a huge man made feature which stands on the surface of the earth for past 2000 years. This feature is a unique and very attractive feature. One thing to be made clear about the Great Wall of China is that when Neil Armstrong stepped on the moon, he was not able to see this wall as a line on the surface of the earth. But the myth says that it is visible. This wall was actually built some 2000 years back and the main purpose of building this wall was to protect the local area from the invading enemies. There was no natural protection from the enemies from this side where the wall stands today, and the only way to keep the people safe was to erect a wall. Qin Shi Huangdi was the first emperor of China who built this wall. The wall was built during the Qin dynasty. Actually before this wall was built as it stands today, it was in a different shape. The first emperor of China united the whole of China into seven states and tried to fortify the Northern side of China by connecting all four walls of protection which existed at that time. This one wall was built by extending the four already existing walls. The wall acted as a protection form the Huns, and it can also provide help in the form of signals of smoke in case there was an attack.

There are many places in this world which act as a source of making money for their home countries. All the sites in thee world which get a lot of people as visitors form all parts of the world are a constant source of income and making money for the home towns. Few parts of the earth are rich in such places while others are not so established when it comes to tourism. This is something really interesting. If a country gets more and more visitors, its tourism will be well developed. The most developed nations of the world all have a very well developed Tourism industry. Africa is a continent which has many such places which are either exceptionally beautiful naturally, or they have a significant historical background. There are many places in Africa which people come to visit. One of these places is the mosque of Djenne.

Some natural phenomenon and places are too important to the human race. Whenever you find a place on this planet earth which is naturally unique in one sense of the word or the other, you always want to see it. This is the case with the Great Barrier Reef. It is the most unique and interesting place to visit. As it is a very important place, there are a lot of people from all parts of the world who come to visit this place every year. There are many special features which are attached to this barrier reef. The reef is the work of the corals and the other coelenterates living in the sea. The Great Barrier Reef has been built by the calcium deposits of these animals over a period of thousands and thousands of years. It is now the greatest and largest features of the earth which is natural. There are many artificial or man made features on this planet earth which are larger than the Great Barrier reef, but there is no other natural feature which is as large as this reef.