The Republic of Croatia has a rich cultural heritage, both tangible and intangible. Although cultural tourism has developed and is growing in the number of tourists, cultural heritage has not yet been valorized and revitalized to the potential it has. In recent times, the concept of sustainable tourism is increasingly recognized as one of the most promising in planning the development of areas with great cultural and natural potentials that the Republic of Croatia abounds. Therefore, the common goal of all involved must be the proper management and exploitation of cultural and natural resources when planning development in such areas, with special emphasis on those resources that are on the UNESCO World Heritage List. In addition to the advantages that tourism brings us, we must also look at the disadvantages that it brings to the cores of historic cities, and we must develop an awareness of the need to protect heritage in general in order to leave it preserved to our descendants. The paper presents the conceptual definition of cultural heritage, as well as approaches to the definition, and special emphasis is on the revitalization of cultural heritage, selected cultural buildings, representative samples of cultural tourism in the Republic of Croatia, namely Šibenik Fortress, Klis Fortress, Hvar Arsenal, Arsenal in Zadar, Ston walls, the Fortress in Dubrovnik, the Pula Arena and fortress Punta Christo also in Pula. Part of the observed sample is on the UNESCO World Heritage List.