This funky Swiss home might not exactly have towers and turrets, but it was indeed built for Italian royalty in the 1970s. This informal dining area features a curvaceous vinyl-clad banquette and grass-green carpet, among other throwback features—ideas you can pluck from in your own home if the all-over look doesn’t appeal. But for its current resident, Prince Emanuele Filiberto di Savoia, the extra-ness of this home is part of its charm: “If today’s kings and queens could build their own castles, perhaps they would do it like that,” he says.