The question of citizenship is becoming one of the central social and political problems, where sovereignty is being challenged by globalisation and militarisation. The old model of citizenship is no longer valid in the contemporary reality of mass migrations and ethnic, religious and cultural integration. Krzysztof Nawratek revives the socio-political potential of the city as a tool for social change. He proposes to establish the city’s own sovereignty by introducing a new type of multiple and flexible city citizenship. City as a Political Idea combines reflection on urban planning, architecture, politics and society. It questions reasons for the existence of contemporary cities as well as their future.