Previously a domain of tourism studies, ‘tourismification’ (or ‘touristification’) has now becomepresent in urban studies. Although diverse empirical descriptions of the phenomenon and processes oftourismification are still dominant, the article presents the stages of the development of the studies in thisarea. The contemporary debate focuses on the consequences and externalities of the development of tourism in cities (new both in terms of the forms and the range). Special attention is given to tourismification of housing resources, which – as demonstrated on the example of Krakow’s city centre district – transforms them both visibly and invisibly. The spatial range of these changes is growing not only horizontally, but also vertically. These changes occur in accordance with various sequences and mechanisms. In spite of the context dependence of tourismification and different susceptibility of urban environments to it, for many, especially historic, cities it has become ‘the sign of the times’ in the second decade of the 21st century. At the same time, tourismification can be seen as a cause, tool or consequence of various interrelated processes observed in contemporary cities.