Listed as a UNESCO World Heritage Site, the Great Wall of China is the largest construction undertaken by man. Built, for the most part, between the 3rd century BC and the 17th century AD, it was intended to protect a unified China from invasions from the north. According to the latest official estimates, the Chinese Wall extends over 20,000 kilometers. The Great Wall is composed of walls averaging a height of six to seven meters, and also features ditches and natural barriers such as rivers or mountains.
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