Buenos Aires

Stop for a midday submarino -- a small chocolate bar melted in hot milk -- at Mark's Deli & Coffee House, an American-style café that also offers toothsome sandwiches such as smoked salmon and cream cheese. Argentine owner Marcos Mantecón fell in love with the simple, healthy café concept while living in New York City's Chelsea neighborhood in the mid-'90s, and his eight-year-old establishment has become a mecca for laptop-wielding expats.

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