La Mansión in the Four Seasons

Tucked behind the Four Seasons hotel is La Mansion, an 88-year-old Belle Époque mansion built by Felix Alzaga Unzué as a wedding gift for his wife. Four Seasons dropped $1 million on a restoration of the regal building’s frescoes, marble, and 24-karat-gold-trimmed wood paneling. While you probably can’t afford the Presidential Suite, where Henry Kissinger, Mick Jagger, and Madonna have reportedly stayed ($8,000 per night), you can feel the luxury for a few hours at the Sunday brunch. The buffet tables include everything from classic Argentine pastas to rarely-seen-in-Argentina fresh oysters. You should feel free to wear your sunglasses indoors: the local society ladies certainly do.