The Great Wall of China ‘zig-zags’ central-east Asia and it is an incredible structure. It took over a thousand years to build and is over 1500 miles in length. It is the longest, oldest, most time consuming construction project ever attempted, in history. It is said that the Great Wall can be seen from Earth orbit, although there is some dispute regarding this. It is only when cameras are used, that sections of the wall can be differentiated from the surrounding countryside.
The Great Wall was built for defensive purposes, especially to stop attack from the north of China. Emperors feared that China would be conquered from the north. The Wall stretches across deserts and up and down mountain ranges.
The Great Wall was part of a Chinese strategy of preventing mass invasion. In the early years the walls were made of rammed earth but as hundreds of years past more sophisticated methods of building were developed with rocks, bricks and mortar being used. It is estimated that over one million people helped in the construction of the Great Wall.