Rue de Rivoli, 75001 Paris, France
This former royal palace is one of the largest museums in the world, and its art collection is considered one of the most comprehensive. It contains around 400,000 works, although—mercifully, perhaps—not all are on display at any one time. There are some pieces that never get taken off the walls. The Mona Lisa and her smile attract millions of visitors each year. Other must-see masterpieces include the sculptures Winged Victory of Samothrace and Michelangelo’s Rebellious Slave, and the Eugène Delacroix painting The Death of Sardanapalus. There’s no real trick to avoiding crowds at the always-packed museum. The best you can do is try to go in the off-season, early or late in the day, and on a weekday. Your chances of being alone with the Mona Lisa will still be slim to none, but you might be able to actually see that enigmatic smile behind the Plexiglas.