The Great Wall of China is a series of stone and earthen fortifications in China. It is the world's longest human-made structure.
The Wall was made a UNESCO World Heritage Site in 1987. Mao Zedong had a saying, "You're not a real man if you haven't climbed the Great Wall" 。
The Great Wall of China appears in several listings of seven wonders of the modern world -- including the recently announced New Seven Wonders of the World.
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