Piraeus of social problems also emerged with the concentration of new populations in the suburbs of the old city, such as Nikaia, Keratsini, Drapetsona and Korydallos. The involvement of Greece in World War II came as a major setback to the city's progress. After the war, the city began its development once more, as damage to the port and the city were repaired and new additions took shape after 1955. Piraeus is now the third largest municipality in Greece; the city proper with its suburbs form the Piraeus urban area, which is incorporated in the Athens urban area, thus making Piraeus
Piraeus popular events in Piraeus is the Ecocinema International Film Festival, staged annually in late February. During this event, a number of films are screened at the Atticon Cinema and the Cineac Cinema, both of which are to be found within the city's Town Hall Square. In the summer, the Maritime Festival and the Piraeus Rock Wave Festival take place, while the Three Kings' Way Festival marks the beginning of the carnival, with all the associated costumes and entertainment. The Municipal Theater of city has been the center of the arts in Piraeus, hosting a variety of cultural events including theater,