19. Jerusalem
18. Puerto Rico
17. Mexico
16. Hong Kong
15. Las Vegas
14. Budapest
13. Zurich
12. Washington, D.C.
11. Vancouver
10. Prague
9. San Francisco
8. Cape Town
7. Rio de Janeiro
6. Maui
5. New York City
4. Sydney
3. Paris
2. Barcelona
1. London
Click here to read the full article by Elisha Hartwig for Mashable.