This new and wonderful museum for fashion lovers is set in the sumptuous 19th-century mansion Yves Saint-Laurent used as his HQ from 1974 to 2002. The king of couture planned for a museum from the 1980s onwards, marking important items with an “M” (for Musée)—some 5,000 in all, plus over 15,000 accessories—which are now part of the Fondation Pierre Bergé – Yves Saint Laurent (which he started with his partner Pierre Bergé in 2002). Though Saint Laurent died in 2008 and didn’t see the opening of the museum, he would undoubtedly have been happy with the result: Successions of temporary retrospectives highlight both his career and his creative genius, resulting in rich and fascinating displays of game-changing outfits—like the Mondrian dress and the “smoking” tuxedo—as well as lesser-known pieces designed for the ballet and the theater. The spaces are beautiful, especially his studio, filled with his books and sketches, unchanged, as if the great designer is about to come home. Book tickets online beforehand to avoid lines.