Venice is built on 118 small islands that are separated by 150 canals. People cross the canals by many small bridges. They can also navigate across the city on boats, both rowing boats and motor boats. The most famous Venetian type of boat called a "gondolas". The buildings in Venice are very old and attractive, and tourists come from all over the world to see them and the canals. This has made Venice one of the most famous cities in the world. The most famous sights are the Rialto Bridge, St Mark's Basilica and the Doge's Palace.