Shànghǎi Museum of Public Security

Museum in French Concession

It may sound turgid and dull, but this museum deals out an ace or two from an otherwise humdrum hand of traffic control and post-Liberation security milestones. The gold pistols of Sun Yatsen and 1930s gangster Huang Jinrong are worth hunting down amid the fine collection of Al Capone–style machine guns and pen-guns. Look out for the collection of hand-painted business cards once dispensed by the city’s top jìnǚ (prostitutes).