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You arrive in Bologna , in northern Italy . You smell bread and coffee . The streets are old and red . Long covered walkways line every road . These are called porticoes . They keep you dry in rain and cool in summer . Bologna has 38 kilometres of them . But there is something else here . There is water under the city . Old canals run below the streets . You can not always see them . Go to Via Piella , near the city centre . There is a small wooden window in a wall . You see a real canal below you . Old buildings rise on both sides . It is one of the best surprises in the city . People used them for work hundreds of years ago . They moved wool and silk on the water . Today , most canals are hidden . But you can walk above them and feel the city 's old life . Bologna is easy to reach by train . It takes about 35 minutes from Florence . Visit the window on Via Piella .
