This shopping complex and underground pedestrian causeway (which you may have to pass through at some point on your trip anyway) is itself worth a short trip. Paris, New York, London, and virtually every major city with a subway once had similar underground complexes, but this area under the Obelisco, where three subway lines converge, seems to have remained unchanged since the 1960s. The shops are nothing special -- several barbershops, shoe-repair spots, and stores selling cheap clothing and other goods make up the bulk of them. Yet together, with their cohesive old signs, fixtures, and furnishings, they look like a movie set.