San Telmo is the heart and soul of old Buenos Aires; it's the city's oldest barrio and its most bohemian quarter. Funky boutiques, outdoor cafes, antique shops, tango salons, and colonial buildings line the cobblestone lanes of this offbeat neighborhood. Yet what makes San Telmo unlike elsewhere is the antique market, Feria de San Telmo, held here each Sunday. The largest antiques fair in Buenos Aires is a great place to shop for things unique and take in the scene.