There are over 7,000 lookout towers that are part of the Great Wall.
Today the walls continue to erode, however historians are trying to protect what sections they can.
The height and width of the wall varies over its length. The current wall built by the Ming Dynasty averages around 33 feet tall and 15 feet wide.
It is the longest man made structure in the world.
Wide moats were often dug outside the wall in flat areas to make an enemies approach more difficult.
Smoke signals were used to indicate an attack. The more enemies that were attacking, the more smoke signals they would make.
It was named one of the New Seven Wonders of the World.
Many people say that the Great Wall can be seen from the Moon without aid. However, this is just a myth.
The wheelbarrow, which the Chinese invented, no doubt was a great help in building much of the wall.
The wall extends through all sorts of terrain, even into the mountains. Its highest point is over 5,000 feet above sea level.
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