Studies using new brain-mapping and wearable devices have shown that unstimulating urban architecture can harm residents’ health, leading to increased rates of depression, cancer and diabetes. Research projects across Europe and North America, including the EU-funded eMOTIONAL Cities project and studies at the University of Waterloo’s Urban Realities Laboratory, are measuring people’s physiological responses to their surroundings. The findings are pushing architects and city planners to prioritize human wellbeing in design, with some cities like London’s Newham borough now including happiness metrics in economic planning.