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 indoor arena and a football ground respectively lying opposite one another, predominating. Mikrolimano and Bay of Zea, the smaller harbours of the city, attract large numbers of visitors with their picturesque vistas and vigorous nightlife, hosting fishing boats as well as yachts and cruise ships. Kaminia, by contrast, is a working-class neighbourhood which still preserves the traditional look of an earlier period. The Municipal Theater in downtown Piraeus was built in 1885 and remains an impressive neo-classical building. Located across from the Neo-Byzantine Piraeus Cathedral, it forms one of the most renowned landmarks of the city and a popular meeting