Between Palazzo Barbaro Wolkoff and the rio delle Torreselle (a small Venetian canal), Ca’ Dario is the most many-faceted jewel on the Grand Canal: a Renaissance façade studded with roundels and discs of polychrome marbles, porphyry and serpentine — nearly eighty medallions glittering like gems — and behind it, looking onto the quiet Campiello Barbaro (small square), a still-Gothic soul of three-lobed arches, loggias and inverted-cone chimneys.