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The Great Wall of China，one of the greatest wonders of the world，was enlisted in the World Heritage by the UNESCO in 1987.Just like a gigantic dragon，the Great Wall winds up and down across deserts，grasslands and mountains，stretching about 6,700 kilometers from east to west of China.With a history of more than 2,000 years，some parts of the Great Wall are now in ruins or even entirely disappeared.However，it is still one of the most appealing attractions around the world.