National Geographic Traveler 50: World's Smartest Cities


 

 

Nº 22 Tallinn, Estonia: population 400,000: Skype was born here, and it’s hardly the only innovation to come from this UNESCO World Heritage city. Public bus and tram transit is free, bikes abound, and the old Hanseatic trading center brims with business, turning a medieval city into a digital-age exemplar.

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