What do we need to be happy? Urbanist and journalist Charles Montgomery finds answers at the intersection of urban design and the science of happiness. He travels to the world's most dynamic cities and shows us their experiences. New evidence from psychology, neuroscience, and Montgomery's own urban experiments is collected in this book. It shows how cities can shape our thoughts and behavior. And ultimately, it’s reassuring: a happy city can save the world, and we can all help build it.