The Rialto Bridge is the most famous sight along the Grand Canal in San Polo, smallest of Venice's six sestieri (districts) and by far the busiest neighborhood. Morning Venetians arrive to peruse the markets for fish, fruit and vegetables, while shops display goods from cheese to wine to desserts. San Silvestro and Rialto Market vaporetto (water taxi) stops add to the steady stream of foot traffic. San Polo is defined by churches including Basilica dei Frari, one of the most important churches sought by art lovers.