Interesting Facts About The 7 Wonders Of The Modern World

The Great Wall of China

At about 13,200 miles (21,200 km) long, this impressive wall took over 200 years to build. It was mainly erected to protect China from attacks from northern tribes, such as the Mongolians. Most of the original wall doesn’t exist because it is constantly being restored and rebuilt due to its age. Between natural erosion and tourism, it is in a state of rapid decline. Because of its huge size, it’s nearly impossible to maintain the entire wall.

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