Why is Machu Picchu a mystery?

Related questions

1. Can you stay at Machu Picchu?
2. Is the Inca trail hard?
3. Is Machu Picchu closing to the public?
4. Can you drink the water in Peru?
5. How long can you stay at Machu Picchu?
6. Why did Machu Picchu take so long?
7. Is Peru dangerous?
8. Is there Uber in Peru?
9. What is the best time of year to visit Machu Picchu?
10. Does anyone live at Machu Picchu?

Tags

1. #mystery
2. #iconic
3. #early
4. #distinction
5. #before
6. #built
7. #century
8. #picchu
9. #sites
10. #abandoned
11. #important
12. #origins
13. #world
14. #record
15. #remain
16. #archeological
17. #despite
18. #machu