AirToob Lightning
The 10 healthiest cities in the world (from this CNN poll):

From CNN's page:

Here are 3 of CNN's selections (in no particular order) - click any image or the links for some interesting information about the city and why it was chosen in the CNN poll. If you don't have time for them all, I recommend the links about Copenhagen - you'll want to go there if you haven't been already!

Land of the elders: Okinawa, Japan

Take a deep breath: Vancouver

Where happiness is the truth: Copenhagen

For the full list of cities and why they were chosen, see here. It seems like there are some great lessons to be learnt from these places.