## 1 Introduction  
Locating and recovering the hidden heritage of cities requires a new look, as it is about changing established knowledge. This new look is provided by new technologies that allow for taking more precise data from the areas to be studied. In turn, this data collection allows for the reconstruction and modeling of these areas and for the comprehensive study of the sites and their monuments from a new perspective. In this article, we present the application of multi-scaled images through the study of a practical case consisting of the location of a hidden section of a 12 th century wall. This section was not documented in the historical sources nor cataloged in the current planning instruments, as it remained hidden among constructions that had been attached to it over time, and it was thought to have disappeared because it was not accessible physically. This type of intervention has a great impact on the valuation and conservation of cultural heritage as it allows for a non-invasive way to have a comprehensive view of the monuments, helping to locate and study remains that are difficult to access, and as a result to catalogue and preserve them. The methodology applied in this research work does not represent a great advance in itself with respect to the current state of the art, but the sciences applied during this method do represent a great innovation; that is, the technical and human equipment necessary to \"unearth\" the remains of the 12 th century wall that was forgotten for centuries need to be very complex to handle. Here, the human team was led by two architects and an economist (which in itself is a great novelty in the application of the BIM method); from there, we worked with an archaeologist, a technical architect, a civil engineer, a public works engineer, and a historian. We focused on seven very different scientific branches (without having support technicians and students) that converge in a very specific point in the city. To successfully carry out each part, a workflow and a scientific method were proposed, which represent the great contribution of this research to the methodological field. Each of the professions that intervened in the process used their most related methods, and it was through the BIM method that the results were overlapped and countered until reaching the conclusion of the exact place and the real trace that the wall had been \"lost\"in the city, as well as where to seek, protect, and prevent the discovery of historically highly relevant remains. This text summarizes all of the actions carried out for the virtual reconstruction of the lost canvas of the wall of the historic city of Caceres [1; 2; 3], a World Heritage City. For this, both preliminary studies (architectural, archeological, historical, etc.) and works executed with the first results on the study of the immediate surroundings of this section of the Caceres fence served to demonstrate the main hypothesis, namely the existence of a lost door of access to the city at this exact point in the wall. For this, exhaustive data and work were taken with remote sensing. In Figure 1, we can see the area of action within the intramural enclosure of the historic center of Caceres, and in Figure 2 you can see the starting path of the wall at that particular point. Figure 1: Location map of the intervention. A—garbage tower; B—Spain arch street tower; C—Bujaco tower; D—pulpit tower; E—Yerba tower; F—oven tower; G—Postigo tower of Santa Ana; H—tower of Calle Adarve del Padre Rosalio; I—Aver tower; J—octagonal tower; K—tower for private use; L—hidden towers (historically located); M—Cornudillas Street tower; N—Merida gate tower; N—Torremochada street tower; O—Torre mochad; P—[PERSON] street tower; Q—Covacha tower; R—tower of the cisterns; S—water well tower; T—river tower; U—southern tower of Caleros Street; V—Caleros tower; W—round tower; X—air tower; Y—relief tower; Z—king’s tower.