The only wonder visible from moon..

One of the famous man made wonder of the world, which is said to be visible from the space is THE GREAT WALL OF CHINA.

The height of the wall is 22 feet to 26 feet. At the base it was 21 feet thick tapering to 18 feet wide at the top. The top layer is layered with brick work and has battlements on the north side. Every 590 feet there is a watch tower. At important mountain passes, the height of the wall is doubled for more protection. The wall is exactly 2500 miles long.

Apart from its size the wall follows the crests and valleys of hills and fits into the landscape because of this it is also considered a great work of art.

Shih Hyang Ti, was a great Chinese emperor of the 3rd century. he ruled over all the cities of Northern China. These cities were repeatedly attacked by the nomadic warrior tribes called the "Huns".

He ordered that the existing walls around the tows strengthened and connected to create a wall protecting all the cities of his province.

The great wall of China is a superb work of military engineering and is built across the hills of Northern China. It took 300,000 men and over 10 years to build the wall. It was built in mud and stone.

The wall was rebuilt by Yung Lo, in 1420.

Great Wall Of China has hidden lot of secrets in its hearts. The archaeologists have proven that the men who used to die working in the extreme weather conditions were buried in the foundation of the wall. It was difficult to work in extreme heat and in chilly winters, but no sympathy was shown and when they died , they were thrown inside the wall and buried.