The metropolization of the world is underway… In fact, it is happening before our very eyes, and the stakes are clear: to make metropolises both infusers and diffusers of growth and innovation. To this end, metropolises are seeking out new approaches and new methods, which require breaking free from the confines of traditional limits and boundaries: territorial, economic, financial and cultural. In 2017, La Fabrique de la Cité shed light on this metropolitan phenomenon and convened representatives of more than 30 different cities in 14 countries to think beyond borders and boundaries.