The article discusses the technical and conservation challenges of adapting the historic crypts of the Church of the Exaltation of the Holy Cross in Łuków. This church is an important example of Baroque architecture with great historical and cultural value. Over the years, the crypts suffered damage from external factors and long-term dampness, which made thorough restoration work necessary. The adaptation process, carried out in recent years, used advanced technologies such as laser scanning and required an interdisciplinary approach combining engineering, conservation, and architecture. The first step was a detailed survey of the crypts’ condition, which helped define the scope of work. The next steps included repairing walls, strengthening foundations, and protecting the structure from further damage. A key focus was preserving the authenticity of materials and the historical aesthetics of the site, which meant using methods that followed the principles of heritage protection. The project was inspired by similar successful adaptations in Poland and Europe that combined heritage preservation with modern functional needs. The planned goal of the project is to transform the crypts into an exhibition space while keeping their historic character. The article highlights the importance of a holistic approach, combining traditional conservation methods with modern technology, as a good example of protecting cultural heritage.