Inside the post you will see the ten best and ten worst cities of our planet, according to Mercer's 2009 Quality of Living survey.
Let's start with the best cities. So, the tenth place is going to Sydney, Australia.
10. Sydney, Australia
Australia's largest city, with a population of nearly four and a half million, Sydney's beaches, beautiful harbour and cultural attractions - including the Sydney Opera House - are its big draws, although, according to Mercer, it is the world's 15th most expensive city.