This equal parts Parisian jewel box, scholar’s retreat, and natural wonder has so many incredible details that it can almost make your head pop off: A brass (brass!!!) kitchen. A double-height library. Marble on marble on marble (literally). Wallpapered ceilings. Hand painted giant patterns of concentric rings splashed across the guestroom walls. A music room lined with pages scribbled by the likes of Beethoven and Mahler. Purple venetian glass chandeliers. Not one but two custom brass spiral staircases. A snakeskin-and-brass console. Paris flea market finds. More light fixtures than one can count. Art Deco furniture. An art filled salon. And the details go on and on and on.