Framed by majestic avenues of centuries-old plane trees, Château de Courances's style is Louis Treize, although its finishing touch—a horseshoe staircase (mirroring the one at nearby Fontainebleau)—was an opulent 19th-century statement made by Baron Samuel de Haber, a banker who bought the estate and whose daughter then married into the regal family of the de Behagués. Their descendants, the Marquises de Ganay, have made the house uniquely and famously chez soi, letting charming personal taste trump conventional bon goût, thanks to a delightful mixture of 19th-century knickknacks and grand antiques. Outside, the vast French Renaissance water gardens create stunning vistas of stonework, grand canals, and rushing cascades. The house can only be seen on a 40-minute tour.
13 rue de Chateau, Courances, 91490, France