Today a fourth bridge, designed by the architect Santiago Calatrava, is going to be built across the Grand Canal.
Designed in 1591 by the architect Antonio da Ponte, who competed against such eminent designers as
Michelangelo and Palladio, Rialto bridge replaced a previous wooden drawbridge. But the first bridge crossing the Grand Canal since the 12th century was a bridge of boats.
Rialto Bridge is a single arch with a span of 28 m. and a width of 22 m. and it is divided into three ramps with 2 rows of shops joining at the top
by the archways.