LOCUS Imaginis is an interactive and collaborative platform that provides access to cultural information about monuments through personal photographs, as the platform enables to collect pictures taken by visitors. First of all, pictures are added into the database. Then, they are positioned in the 3D scene on the digital model of the monument and they are semantically annotated. As a consequence, this tool provides access to textual and graphic information describing the photographed site (semantic, spatial, historical entries, etc.). When visitors consult the database and select 2D images, they are superimposed onto a three-dimensional scene. Subsequently, visitors can interact both with images and the 3D-model to highlight building parts by colour and to display textual information. Accessible on-site, LOCUS IMAGINIS is a support proposing an innovative approach in the case of educational workshops. When accessed on line, it is also a useful tool for tourists, who can extend a visit by recreating the journey through their own photographs and enrich information available in the database. The aim of the project is visit preparation, exploration of new ways of understanding monuments morphology, expert access to iconographic corpus (historians, architects, archaeologists, etc.).