Why is Machu Picchu one of the 7 Wonders of the World?

Related questions

1. Can you stay at Machu Picchu?
2. Is Peru expensive to visit?
3. Why did the Spanish not destroy Machu Picchu?
4. What purpose did Machu Picchu serve?
5. Is the Inca trail hard?
6. Has anyone died on Angels Landing?
7. How long can you stay at Machu Picchu?
8. Does anyone live at Machu Picchu?
9. Who built the Inca Trail?
10. Is Peru dangerous?

Tags

1. #wonders
2. #structures
3. #stone
4. #picchu
5. #walls
6. #voted
7. #world
8. #three
9. #machu
10. #polished
11. #worldwide
12. #primary
13. #classical
14. #internet
15. #temple
16. #style
17. #built
18. #windows
19. #seven
20. #watana