Palacio San José, Concepción del Uruguay, Argentina

Topped by twin towers and surrounded by elegant gardens, Justo José de Urquiza’s ostentatious pink palace is 33km west of Concepción. Set around an arched patio, with a walled garden out back, it was built partly to show up Urquiza’s archrival in Buenos Aires, Juan Manuel de Rosas, and partly to show the power and wealth of Entre Ríos province. Local caudillo Urquiza was largely responsible for Rosas’ 1852 downfall and the eventual adoption of Argentina’s modern constitution.