Palacio Duhau Park Hyatt Buenos Aires, Recoleta, Buenos Aires, Argentina
A neoclassical palace on Recoleta's most iconic street, with a wonderful balance of 1930s elegance and hip design, two wings linked by an art gallery under the lovely gardens; soothing, tech-savvy rooms, and the city's most extensive spa.
Top tip? Book a suite in the original palace building - they feel larger and have kept a number of original period details.