On a 2005 Antarctica trip, I also spent some time in Buenos Aires, Argentina. San Telmo is the oldest neighborhood in Buenos Aires. On Sundays it is crowded with locals and tourists there for the antique fair and flea markets. I returned there a second time to get a sense of the neighborhood on a sunny, quiet day. (I include everying south of Plaza de Mayo to Parque Lezama here, perhaps stretching San Telmo's boundaries a bit.)

Mark Wasson, http://www.markwasson.com > Trips has detailed summaries of my trips