The ongoing processes of globalization and regionalization have drawn attention away from the traditional domains of nation-states and their interaction. However, the border-crossing activities of non-state agencies, organizations and institutions should not be overlooked, as they can shed new light on our common understanding of the contemporary world. Using the concept of transnational social spaces, contributors to this volume demonstrate the importance of transnational spaces. A collaborative project by experts across the social science disciplines, Transnational Social Spaces focuses in particular on the German-Turkish context.