The application is a bilingual multimedia guide through the Church of the Holy Mother of God from the 14th century, in the village of Donja Kamenica near Knjaževac. It provides users with detailed information about the history, architecture, frescoes of this medieval church, cultural monuments of great importance, but also about the conservation and restoration work carried out on it. It contains various materials, 3D models and rich photo galleries, technical drawings and cross-sections from different periods, as well as a virtual tour that allows users to see the exceptional frescoes of this church from the second half of the 14th century. The added value of the application is a brief overview of the medieval monastery of St. Trojica in Gornja Kamenica.