Hamburg

The flag of Hamburg displays the city's coat of arms — a white castle with three towers on a red field. The central tower is taller and topped with a cross, while the two flanking towers are capped with six-pointed stars. The closed gate symbolizes the city's strength and defensive capability. This fortress emblem has represented Hamburg since the 12th century and reflects the city's medieval status as a fortified Hanseatic trading port. The red background is associated with the Hanseatic League. Hamburg's official designation as 'Freie und Hansestadt Hamburg' (Free and Hanseatic City of Hamburg) underscores its proud mercantile heritage.