Book excerpt: In this colourful new history of Venice, Elizabeth Horodowich, one of the leading experts on Venice, tells the story of the place from its ancient origins, and its early days as a multicultural trading city where Christians, Jews and Muslims lived together at the crossroads between East and West. She explores the often overlooked role of Venice, alongside Florence and Rome, as one of the principal Renaissance capitals. Now, as the resident population falls and the number of tourists grows, as brash new advertisements disfigure the ancient buildings, she looks at the threat from the rising water level and the future of one of the great wonders of the world.