Fodor's Expert Review Gagosian Gallery

This internationally renowned modern gallery has two large Chelsea branches (the other is at  522 West 21st Street, between 10th and 11th Avenues) as well as three galleries on the Upper East Side and more than 10 outposts in cities around the world. Perhaps the most powerful dealer in the business, Gagosian Gallery shows works by heavy hitters such as Pablo Picasso, Jean-Michel Basquiat, Urs Fischer, Richard Serra, and pop-art icon Roy Lichtenstein, in addition to less well-known artists.