The paper gives an appraisal of Polish cities in the context of processes and problems observed in cities of highly developed European countries. These last cities, in particular those situated in the hard core of EU, enter a new development stadium. Interconnected by networks of multifarious links, they create an integrated urbanised space of the highest ability to compete in the global economy but lose at the same time the character of relatively closed and spatially distinguished socio-economic systems. The paper, pointing at the processes that lead to this phenomenon, stresses that they are already visible in Poland but not advanced. Poland is a country of a delayed urbanisation and cities the economic base of which is not competitive in Europe. These cities possess a not bad human but rather weak social capital and the urban space is of a low quality. The paper outlines the main challenges Polish cities are facing in the era of European integration and presents also the most frequently discussed visions of XXI century European city described through development goals and strategies.