1 / 5

Reykjavík, Iceland

Not only are the array of aquatic activities in the capital city Justin Bieber–approved, but the open waters are so pristine that travelers are actually encouraged to drink it in certain areas. The country is also a pioneer in developing geothermal energy, an alternative to fossil fuels that has transformed the area into one of the most environmentally friendly places out there.

5 of the Cleanest International Cities You Need to Visit

From the chill of Reykjavík to the heat of Rwanda, these locales that are leading the charge for a greener future