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So many people confirms that the wall can be seen from the moon, we don't know if this is true but we don't know also if it's false.

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The only thing that visitors can do is go through and take photos.
If they want to walk 21km, they would cross it all over.

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It has not changed physichally, but it has changed in other ways.
Then The Great Wall of China was not opened to the public, but now there is a lot of touruists visiting it every day, so now it is opened to the public. That's the only way it has changed.

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It was built to protect the north border of The Chinese Empire during the succesive Imperial Dynasies of the attacks of the nomads xiongnu of Mongolia and Manchuria.

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It was built an rebuilt between the centuries V a.C and the century XVI.

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This famous monument is an ancient fortification.

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It was built in four parts, because of his length.
The 1st Part was ordered to be built by Qin Shi Huang
The 2nd Part was built by the  Han's dynasty.
The 3rd Part was built by the    Jin's dynasty.
The 4th Part was built by the Ming's dynasty.
No one of those leaders of that dynasties.