In a city with canals in place of roads, it only makes sense that public transportation consists of watercraft. Known as the vaporetti, Venice's water bus system is the city's major form of public transportation. These buses (vaporetto is singular, vaporetti is plural) take visitors along the main canals, to the outer islands, and around the lagoon. Although often crowded, they are by far the least expensive way to get around (other than walking). If you're visiting Venice, sooner or later you'll find yourself on a vaporetto.