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 Ship and the Museum of Electric Railways, hosted in the Piraeus station. The Municipal Art Gallery and the Municipal Library, one of the largest in Greece, are also prominent within the culture of Piraeus. Traditionally, Piraeus has played a major role in Greek sport. The city boasts the most popular and one of the most prestigious Greek multisport clubs, Olympiacos CFP. The other major club is Ethnikos Piraeus, with a long athletic tradition, while other historic clubs are Atromitos Piraeus F.C. and Peiraikos Syndesmos. Others historic clubs from another city of Piraeus are Proodeftiki F.C. of Nikaia and Ionikos of