Musée d’Art Moderne de la Ville de Paris

The permanent collection at Paris' modern-art museum displays works representative of just about every major artistic movement of the 20th and (nascent) 21st centuries, with works by Modigliani, Matisse, Braque and Soutine. The real jewel, though, is the room hung with canvases by Dufy and Bonnard. Look out for cutting-edge temporary exhibitions (not free). Download the free multilingual app online.