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This study investigates the architectural and archaeological heritage through data acquisition and the creation of representative models for documentation. Modern digital technologies enhance precision, reduce subjectivity, and integrate quantitative and qualitative aspects. However, full standardization remains challenging due to the specificity of each case. Advanced techniques like LIDAR and photogrammetry enable detailed documentation, supporting interdisciplinary analyses and result sharing. The research focuses on three late-medieval Roman sites: the lower basilica of San Crisogono, the complex of Santa Balbina, and the atrium of Santa Maria Antiqua. Surveys produced high-resolution 3D models for analyzing spatial, structural, and decorative elements. By combining digital acquisition with historical and archaeological studies, the project proposes reconstructive hypotheses and enhances understanding of the sites’ evolution and conservation needs, demonstrating the potential of digital tools in preserving cultural heritage.