Take a walking tour with a professional private guide to explore one of the most celebrated piazzas in the world. St. Mark’s Square is surrounded on 3 sides by magnificent structures such as the 15th-century Clock Tower, the Procuratie Vecchie, Procuratie Nuove and Ala Napoleonica. On the fourth side stands the outstanding St. Mark’s Basilica, with its Clock Tower rising above the open area known as the Mercerie. Your guide will tell you about the history and architectural styles of the Clock Tower, the Bell Tower, the Correr Museum and the Bridge of Sighs. St. Mark’s Bell Tower is the highest structure in Venice. Originally built in the 9th century, it has been rebuilt several times since. It unexpectedly crashed to the ground in 1902 and was rebuilt following the original design, incorporating the ancient bells. The Bridge of Sighs connects the Palazzo delle Prigioni and Palazzo Ducale, or Doge’s Palace. It is called the Bridge of Sighs because in times past, convicts were forced to enter prison through this bridge. According to the legend when they had their last glimpse of Venice they would let out a sigh. Visit the interior of St. Mark's Basilica to admire its many treasures, including the Pala d’Oro, the statues, amazing glass and carvings.