A privately run museum in the basement of an unmarked apartment block in the French Concession — the security guard at the gate hands you a map with the entrance circled. Inside is the world's largest private collection of Chinese propaganda posters from 1949 to 1979, beautifully displayed: hardworking peasants, smiling factory workers, the heroic Red Army, anti-American cartoons, and the personality cult of Mao himself.
It is a startling place: the artistic quality of the posters is high, the politics are uncomfortable, and the curator is happy to discuss both. About an hour's visit. Modest entrance fee, cash only. Highly recommended if you have any interest in 20th-century history or visual culture.