Top amazing facts about "the longest wall in the world"

At 21,196 km long, the Great Wall of China is the longest man-made structure in the world.

The Great Wall of China has a total length of about 21,196 km, built through many dynasties over more than 2,000 years. This is the longest man-made structure in the world . Photo: Shutterstock.

The Great Wall is not one continuous wall. Trenches and natural barriers such as rivers and hills are also considered part of this "world's longest wall". Photo: Wikipedia.

The force that built this wall included civilians, prisoners and soldiers,...Photo: Shutterstock.

A 2014 report by the Great Wall of China Association found that less than 10 percent of the monuments could be classified as being in good condition, while 74 percent were classified as being in poor condition. Not only natural factors, but also human factors have had a negative impact on the wall. Some rural areas have been demolished for soil or building materials.

Builders of the Great Wall of China used glutinous rice to strengthen the mortar. The amylopectin in rice is believed to be one of the reasons the Great Wall of China has lasted so long. Photo: Shutterstock .

In fact, despite its impressive length, the Great Wall's thin structure makes it invisible to the naked eye from space. Photo: Shutterstock.

In 2007, the Great Wall of China was voted one of the New 7 Wonders of the World. Photo: Shutterstock.

The Great Wall is not a single structure. It consists of watchtowers, barriers, and forts, etc. along the walls, together forming an integrated defense system. Photo: Shutterstock.

The easternmost point of the Great Wall is located at Shanhai Pass, right on the coast. Photo: IT.

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