Melbourne, Australia. Prasit photo/Getty Images Time Out ranked the best cities in the world based on happiness, affordability, and quality of life. The magazine surveyed of over 24,000 participants across 150 cities, plus over 100 experts. The list is full of popular tourist destinations, with a few surprises. Whether you're looking for a quick getaway or to plant roots overseas, there are plenty of places to choose from. To make that decision a little easier, Time Out surveyed more than 2...