The modern world is moving to cities. Urban population is predicted to reach 66 % from total by 2050. As a result, the cities themselves are evolving trying to meet the new challenges: traffic density, ecological issues, and social unsustainability. The application of innovative technologies such as artificial intelligence (AI) and the internet of things (IoT) makes them ‘smart’. And the demands of contemporaneity make the time we live in the age of smart cities. Open and Agile Smart Cities network counts up to 100 smart cities in 23 countries so far, and China is planning 290 by 2040. So, what are they like — those cities of the future?