Also known as "Espacio Virrey Liniers" after its one-time owner the first Count of Buenos Aires and Viceroy of the Rio de la Plata, this is the only remaining colonial house in the city center. Tour the eighteenth-century grandeur, with its expansive stained glass and ornamental carpentry. The building also serves as a library and research center for historians. There's a charming deli inside the house named for the Virrey's lover called La Perichona, a great spot to escape the busy La Boca scene—come for an empanada or roast beef sandwich with a glass of chilled rosé in the early evening.