http://venezia.marcomm.info/ADV_Restauri.pdf
Venice’s most famous monument, the Rialto Bridge, was constructed in 1591 to a design by Antonio da Ponte, in a single depressed-arch span of twenty-seven meters and a width of twenty-two meters. The width is divided into three ramps by two rows of shops, linked between them in the center by two large arches; the shops are entered from the central ramp. The restoration work regards the parapets, formed by balustrades in Istrian stone, and the walkway (steps and landings), consisting of sandstone slabs.
