Founded in 1889 by Jeanne Lanvin, couture shop was the fashion magnet of the ’30s, drawing stars from across Europe. Today, longed-for label is worn by icons like Michelle Obama, Kanye West, and Angelina Jolie. Pick up a pair of famous silver sneakers, or just admire designer Alber Elbaz’s fantastical windows. Triplex boutique is men’s only spin-off, down the block from the flagship. Bespoke tailoring service is available. Of course.