The document discusses methods and technologies for creating digital replicas in cultural heritage. It provides examples from research projects on 3D reconstruction of archaeological sites like the Banditaccia Necropolis in Cerveteri and the Sarmizegetusa archaeological site. The research team uses techniques like photogrammetry, 3D scanning, and virtual reconstruction to create digital replicas for uses like virtual museums, academic research, and games. Validation of models is an ongoing challenge. The document emphasizes the multidisciplinary nature of the work and potential applications of digital replicas.