This is not even close to comprehensive, but it's a start. Clearly I need to get out more. There are huge blank spaces! I'd love to visit Africa, Australia and South America soon.

Favorite cities off the top of my head:

1. San Francisco, CA, USA

2. Jaipur, India

3. Tangier, Morocco

4. Burgos, Spain

5. Seattle, WA, USA

6. New Orleans, LA, USA

7. New York City, NY, USA

8. Zagreb, Croatia

9. Brussels, Belgium

10. Kathmandu, Nepal

11. Lourdes, France

12. Niagara Falls, Ontario, Canada