The URBiNAT Community of Cities is a clear expression of European diversity, in geographic, cultural, environmental, societal, political and economic terms. This community includes the capital cities of Sofia and Bruxelles, the major historic cities of Porto, Nantes, Sofia, and Siena, and the relatively young cities of Høje-Taastrup, east of Copenhagen and Nova Gorica on the border between Slovenia and Italy. This diversity of urban environments will allow URBiNAT to test its solutions in different contexts in order to achieve a good replication process.