International migration is high on the public and political agenda of many countries, as the movement of people raises concerns while often eluding states' attempts at regulation. In this context, the 'Migration Without Borders' scenario challenges conventional views on the need to control and restrict migration flows and brings a fresh perspective to contemporary debates. This book explores the analytical issues raised by 'open borders', in terms of ethics, human rights, economic development, politics, social cohesion and welfare, and provides in-depth empirical investigations of how free movement is addressed and governed in Europe, Africa, the Americas and Asia. By introducing and discussing the possibility of a right to mobility, it calls for an opening, not only of national borders, but also of the eyes and minds of all those interested in the future of international migration in a globalising world.