Tourism is the greatest social, anthropological and economic phenomenon of our times. Its impact on the lives of cities, changes in landscapes, and countries' and regions' cultures is so great that nothing remains intact wherever it goes. Regarded by some as a source of devastation that particularly affects historical city areas (but whose waves spread far beyond urban limits) and regarded by others as the achievement of the most positive interests and the highest ideals, tourism today is a subject of debate, controversy and urban conflict. By choosing it as the central theme of this number of Electra, we wish to treat it as a complex phenomenon that invites a wide variety of analyses by different disciplines and raises varying ideological viewpoints.