If you live in a major metropolis and have had enough of the steep living costs, poor air quality, rampant crime and other negatives, you're not alone. A slew of big cities around the globe are seeing an exodus of residents who are leaving the bright lights behind for a quieter, less stressful life elsewhere. We take a look at 15 popular urban areas that people are fleeing in their droves and reveal exactly why they are relocating.