Standing as silent sentinels along Europe’s coasts and national borders, bunkers have gradually become modern ruins, their strategic military function long obsolete. Historically, they have been perceived as marginal elements in urban and landscape contexts. For a long time, they were considered an academic taboo due to their association with the traumatic events of a recent past. However, in recent years, bunkers have been increasingly included in rehabilitation, reuse, and enhancement programs. These initiatives recognize bunkers as part of a broader territorial and historical network, as essential sites capable of reinforcing collective memory and strengthening civic identity. Building on these considerations, this paper presents the first outcomes of Constellation XX, a project dedicated to investigating Sardinia’s World War II defensive heritage. The project’s primary goal is to develop appropriate tools that can activate processes of value recognition and enhancement, tools aimed not only at safeguarding and conserving this heritage as a form of historical memory but also at stimulating new ideas and opportunities for the re-appropriation of these places. In this vision, the bunker is reimagined as a key asset in cultural tourism and heritage management strategies. To this end, the project proposes a standardized investigation protocol for these structures based on a research methodology that combines archival analysis, satellite imagery interpretation, and in situ surveys. This approach ensures a comprehensive understanding of the sites. All collected data has been systematically organized into a database and made accessible through a georeferenced GIS platform. By reframing their marginal condition, the project analyses bunkers as a significant landmark, aiming to define the XX century constellations and reinterpret their role as sustainable opportunities for the coastal territories of Sardinia.