Tourism around the world is gaining momentum because there is so much that people want to see and experience. In fact, visiting another country is one of the best ways to learn about that country's culture and language The topic of this work is digital technology in cultural heritage, its application, application possibilities and examples from the world and Croatia, the cultural heritage of the city of Senj and a project based on modern technology in cultural tourism. Cultural tourism is recognized as an important economic and social factor, and the main drivers are related to the growing desire for cultural awareness and learning. The goal of this paper is to emphasize the importance of the application of digital technologies in the development of the tourist offer through examples of successful projects, and to present a project proposal that combines digital technologies and the cultural heritage of the city of Senj. By researching various digital technologies used in culture, we can say that digital technology is used very little for the purpose of culture and its heritage, especially in Croatia where we have only a few examples of technology in culture or in tourism, and this work could contribute to the greater development of modern technology as in cultural tourism. The "Senia" application would contribute to the development of digital cultural tourism in Croatia, specifically in the city of Senj. The application would serve as a tourist guide through the city of Senj, and would show elements of augmented reality (AR) at certain landmarks, which would have a positive effect on the expansion of the city's tourist offer.