Fodor's Expert Review Feria de San Pedro Telmo
Plaza Dorrego is the heart of the Feria de San Pedro Telmo—an open-air market that stretches for more than a kilometer (0.6 mile) along Calle Defensa each Sunday. Thrust your way through the crowds to pick through antiques and curios of varying vintages as well as tango memorabilia, or watch dolled-up professional tango dancers perform on the surrounding cobbled streets. The unofficial "stalls" (often just a cloth on the ground) of young craftspeople stretch several blocks up Defensa, away from the market proper. As it gets dark, the square turns into a milonga, where quick-stepping locals show you how it's done.