Situated on the north coast of Spain, the bustling port of Santander is perhaps most famous for being the original home of Banco Santander, one of the world's biggest banks.
As well as being the birthplace for a banking giant, the city is also jostling to be one of the world's most innovative and technologically agile cities by harnessing the so-called internet of things.
To achieve this, thousands of smart sensors have been dotted around the city's streets, enabling a range of data to be analysed.
"The internet of things unites all the data coming from sensors, along with the data the city already has and data provided by citizens," Joaquin Gonzalez, director of Telefonica in Cantabria, told CNBC's Sustainable Energy.
"With this knowledge we can make decisions, decisions which help us along the path towards a more productive city," Gonzalez added.
Key features of Santander's 'smart' city include devices installed at streetlights and facades to monitor temperature, noise and emissions.