What is the most expensive artwork in the world?

Related questions

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3. Why is Van Gogh painting so famous?
4. Why did Vincent cut off his ear?
5. Why is the Mona Lisa a big deal?
6. Why is the sunflower painting famous?
7. Why is the Mona Lisa such a big deal?
8. What do sunflowers symbolize?
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Tags

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5. #leonardo
6. #million
7. #purchased
8. #prince
9. #artwork
10. #mundi
11. #saudi
12. #christie
13. #november
14. #unknown
15. #confused
16. #salvator
17. #expensive
18. #vinci