1. Tijuana, Mexico: 687
2. London: 256
3. Mexico City: 142
4. Hong Kong: 107
5. Nassau, Bahamas: 92
6. Tokyo: 79
7. Nogales, Mexico: 76
8. Santo Domingo, Dominican Republic: 73
9. Kingston, Jamaica: 70
10. Nuevo Laredo, Mexico: 69
11. Ciudad Juárez, Mexico: 58
12. Dublin, Ireland: 51
13. Guadalajara, Mexico: 50
14. Frankfurt, Germany: 47
15. Matamoros, Mexico: 45
16. Jerusalem: 37
17. Madrid: 36
18. Manila: 36
19. Montreal: 36
20. San José, Costa Rica: 35
I'm surprised Amsterdam didn't make the list.. and Tokyo, Hong Kong, and London are surprisingly high..
http://travel.latimes.com/articles/la-t ... -2009feb08