What is an interesting fact about the Great Wall of China?

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Tags

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2. #structure
3. #21196
4. #about
5. #great
6. #unesco
7. #became
8. #length
9. #heritage
10. #china
11. #total
12. #course
13. #years
14. #longest
15. #world
16. #different
17. #built
18. #hundreds
19. #december
20. #13170
21. #dynasties