People are irrational because of prejudices. The best way to overcome prejudices is to live in a culture with a significantly different view of the world than your own. Plus, you get to go a step further and learn there are reasons behind prejudices, instead of just rejecting a belief and its connotations because the believer is prejudiced.

So, I think living in different parts of the world is only indirectly useful. The important thing is to live in a new environment among people with a different culture.