Part of a palazzo built in the late 15th century, this multi-arch spiral staircase (a mini-Tower of Pisa) was artfully restored in 2016, featuring a belvedere with fabulous views of Venice. Halfway up, the Sala del Tintoretto (Tintoretto Room) contains the rare portrait of Lazzaro Zen, an African who converted to Christianity in Venice in 1770, as well as a preparatory painting by Tintoretto of his monumental Paradise (the final version is in the Palazzo Ducale). You can buy timed entry tickets in advance at www.ticketlandia.com (advisable in peak season).