Just a stone's throw from St. Mark's Square, you'll find the elegant Bridge of Sighs, one of Venice's most famous and photographed landmarks. While it's a beautiful sight from the outside, especially from the nearby Ponte della Paglia, the real story is within. This enclosed, white limestone bridge was the final walk for prisoners from the Doge's Palace interrogation rooms to the New Prison, who would sigh at their last glimpse of beautiful Venice through the stone-barred windows. To experience their view and walk across it yourself, you'll need to take a tour of the magnificent Doge's Palace, which is an essential Venetian experience.