Why Great Wall of China is a wonder of the world?

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Tags

1. #series
2. #china
3. #historical
4. #raids
5. #other
6. #stone
7. #fortifications
8. #various
9. #earth
10. #states
11. #empires
12. #great
13. #across
14. #brick
15. #built
16. #northern
17. #borders
18. #tamped
19. #invasions
20. #protect
21. #along
22. #materials
23. #chinese
24. #generally
25. #against
26. #groups
27. #nomadic