We found interesting to share a few links to publications on the Internet where authors are describing Barcelona as one of the best Smart Cities in the world:

https://www.digitaltrends.com/home/barcelona-smart-city-technology/

http://fortune.com/2015/07/29/barcelona-wired-city/

http://datasmart.ash.harvard.edu/news/article/how-smart-city-barcelona-brought-the-internet-of-things-to-life-789