Virtual modelling and 3D reconstruction are common tools used in the field of cultural heritage to recreate, analyse and visualise large objects (for example, archaeological sites and architectural buildings) and small objects such as sculptures, ceramic tiles or silver, marble and wooden artefacts. At present, it is possible to apply different technologies to achieve accurate photo‐realistic 3D models. On the one hand, the precise modelling of existing 3D data is usually difficult and expensive as “reality” is complex per se; the more complex the object, the more complex the model. On the other hand, models are often achieved with the purpose of visualising the past state of monuments that nowadays are no longer fully conserved. In this sense, “augmented reality” (AR) technology can play an important role in cultural heritage. First, it permits the simultaneous viewing of both virtual and real 3D data. Second, the modelling of the entire object is no longer necessary. Third, it is possible to have full “immersion” of the viewer. This paper overviews the new technology of AR, as used in the world of cultural heritage to display past (now partially or totally lost) and present scenes together. It goes on to describe some practical experience of applying AR to the re‐creation of two features, a Baroque vault and a Renaissance reredos, formerly present above the high altar of Valencia Cathedral in Spain.