Built between 1914 and 1920, the City Hall is one of the few buildings in Rotterdam to have escaped the bombing of the Second World War. Its belfry houses a fine peal of 63 bells. It's worth taking a look at the Art Deco vestibule and central lobby: in addition to the dome and aisles, the stained-glass windows evoke the importance of the port and Rotterdam's status as a trading centre, illustrated perfectly by the town's motto Navigare necessare est (to sail is necessary).