Mexico City

There are over 20 million people in Mexico City. Thats three times as busy as London. Three times as many cars. 3 times as many buses. 3 times as many traffic wardens. 3 times as many mothers in 4x4's on school runs.

It's also the worlds most dangerous city.

You'd think people would move away really.

(Perhaps they are all waiting for a property price boom ?)