The main objective is to define & promote a Cultural Route on architectures of totalitarian Regimes of 20th century, as leverage for their economic valorisation. ATRIUM is supposed to pursue the following specific objectives: (I) identification of case-studies in the areas concerned (analysis of urban maps, urban & architectonical works), and hence of their underlying concept of city and power as well as meanings in term of relationships between citizens & totalitarian institutions; (II) selection of buildings & places of particular signification under past regimes, which could have (or currently have) a new aesthetical, functional & social task in contemporary democratic city; (III) preparation of a trans-national Manual (also for training purposes) of wise management, preservation re-use & economic valorisation of this "inconvenient" heritage; (IV) identification, collection & digital cataloguing of photograph archives, films, oral witnesses, furniture, etc. of the epochs concerned; (V) design of a cultural route on this heritage, in compliance with requisites set out by the Council of Europe (VI) promotion of forms of cultural tourism for economic valorisation of heritage concerned (and training of necessary operators), capable of attracting segments of international, especially European, growing cultural tourism demand, & hence to create new services & jobs.