Visit the famous bronze horses.
Palazzo Ducale
Don't miss the guided tour named Secret Itinerary, which will let you discover the part of the palace where the city's administration worked, as well as Casanova's jail and the wonderful five hundred year old roof structure. A MUVE museum.
Campanile di San Marco
The current tower dates from 1912; an exact replica of the previous tower which collapsed in 1902. The top of the tower offers great views of Venice and the lagoon.
Torre dell'Orologio
Having been closed for restoration for many years, the restored astronomical clock is now visible. The fascinating tour of the clock mechanism (and rooftop bell) can only be visited on a guided tour, in English: M-W at 10:00 and 11:00, on other days at 14:00 and 15:00, in French M-W at 14:00 and 15:00, advance reservation required online or by phone at +39 041 5209070. A MUVE museum.
Rialto Bridge
The bridge has become one of Venice's most recognizable icons and has a history that spans over 800 years. Today's Rialto Bridge was completed in 1591 and was used to replace a wooden bridge that collapsed in 1524.
Basilica di San Marco
Saint Mark's Basilica is on the Piazza San Marco and is one of the highlights of a visit to Venice. As with most churches in Italy, you must be dressed appropriately to be allowed in; this means no short skirts or bare shoulders. You are not allowed to carry large bags or rucksacks inside, sometimes even small daypacks may need to be deposited. Storage is available just around the corner from the main entrance (free of charge). Filming and photography is forbidden so be prepared in advance. The visit within the basilica lasts ten minutes. Waiting for entry into the basilica can last up to five or so hours and it may be wise to use a ticket service to reserve your visit (reservation costs €3). Once you have a reservation you can take the group entrance on the left, where you hand in the printout of your reservation.