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Argentina
Argentina's enormous north-south length gives it nearly every climate zone in one country. The Northeast, including Iguazu Falls, is subtropical, while the central Pampas around Buenos Aires have a temperate climate with clear seasons.
The Andean Northwest is high and arid, while Cuyo (Mendoza) has a dry, semi-desert climate that, combined with irrigation from Andean snowmelt, makes it ideal wine country.
Patagonia, in the far south, is cool to cold year-round and famously windy, with weather that can shift dramatically within a single day.