Chiang Mai ranked 2nd in the world just after Bangkok as best city on Travel and Leisure "Best of the Year" voting.

Full list below.

1. Bangkok
2. Chiang Mai
3. Florence
4. San Miguel de Allende, Mexico
5. Rome
6. Sydney
7. Buenos Aires
8. Oaxaca, Mexico
9. Barcelona
10. New Your City

Source: http://www.travelandleisure.com/worldsbest/2010/cities