El Centro, Buenos Aires
Concierge.com's insider take:
Buenos Aires and its suburbs form one of the world's largest metropolitan regions and its throbbing heart—all commercial bustle and sensory overload—is the Centro. The area hinges on the Plaza de Mayo, home of the Casa Rosada, and it includes the teeming pedestrian mall of Calle Florida, the theater row along Avenida Corrientes (the Broadway of B.A.), the nearly 500-foot-wide Avenida 9 de Julio, the soaring (if somewhat pointless) Obelisco, and the magnificent Teatro Colón, one of the world's great opera houses. For a respite, duck into Café Tortoni on the rambla-like Avenida de Mayo for a quick cortado (espresso cut with milk).