The NUBES project focus on the definition of an informative system on an architectural scale which exploits the relations between the 3D representation of the building (shape, dimensions, state of conservation, hypothetical restitution of its transformations in time) and heterogeneous information coming from the various fields (technical, documentary, historical). The platform aims at organizing multiple representations (and associated information) around a model of semantic description with the aim of defining a system for the multi-field observation of historic buildings. The principles studied are implemented in a Web Application, whose main functionalities we present.