The aim of the study was to identify ways of digitalising specific cultural heritage sites in the space of six selected Polish cities: Białystok, Bydgoszcz, Gdynia, Kielce, Olsztyn and Rzeszów. The data used in the analysis came from four types of online sources. Firstly, these were the official websites of the 18 sites under study, existing in the 2022. Another source of information was the tourist review portal Tripadvisor. In addition, information from popular promotional platforms and social networks was taken into account. The study used techniques applied for existing materials analysis, as well as the following methods: analytical, descriptive, internet query, statistical and graphical. An own zero-one rating system was applied, assigned to six categories of assessment of the digitalisation level of the sites. Among the analysed cities, the best results as to the level of digitalisation were obtained by the facilities located in Kielce, Rzeszów and Bydgoszcz, respectively.