Currently, the study and the exhibition of the history and artistic traces of city development are gaining new interest. Several Italian and European cities are proposing, or have just established, organisations or museums intended to 'display' their past. Recently a research group has been constitued at the University IUAV of Venice based on the premiss that a contemporary City Museum has to be a conduit for knowledge to a large and varied public including, on equal terms: citizens, immigrants, tourists and people with cultural and professional interests in the urban environment. In this sense Venice seems to be a very good clase-study. While an important initiative, such as the constitution of a new Museum of the twentieth century in Mestre (the mainland of Venice) is going on, the research group thinks that this kind of institution, within the framework of a very complex and rich system of museums, such as the Venetian one, could have a wide remit. In fact, one of the special key issues for Venice in the twentieth century has been opening up its cultural and productive activities to the external world. Foreigner visitors, as well as many citizens have always had the vision of Venice as a medieval and renaissance city with a very old historical centre. Yet in the course of the twentieth century, the urban settlement had greatly changed in a very interesting and innovative way. This has to be explained and shown to both tourists and the Venetians. [ABSTRACT FROM AUTHOR]