Cosmopolitan Habitat promotes a research agenda for urban resilience, understanding cities as global avant-garde dealing with the planetary challenges of climate change, migration, and social fragmentation. Within the framework of the Green Deal, Europe is advancing ideas and innovations aimed at manifesting change and long-term strategies for our cities in order to achieve the aims of resilience and sustainability. At the same time, we are facing the impact of the Covid-19 pandemic on our cities and on our ways of imagining and constructing urban futures. How can cities become new, concrete places to invent, explore, experiment, and live in open communities that are able to face global challenges while also enhancing liveability, inclusivity, and urban economies? Cosmopolitan Habitat presents conceptual models, urban strategies, and spatial practices for the Open City, combining urbanism, architecture, humanities, culture, economy, and politics.