"Residui Urbani" is a research project that explores the relationship between humans and nature within cities, examining the phenomenon of urban voids in the outskirts of Rome. These places, remnants of past capitalist exploitation, persist in the contemporary landscape, taking on the role of the city's "unconscious," where all that has been repressed is housed. Following the theory developed by Gilles Clément in the "Manifesto of the Third Landscape" (2005), the project collects photographic evidence of the signs of anthropic exploitation in areas of suburban abandonment. The result of this accumulation is the formation of post-human agglomerations, often seen as problematic by local communities, yet essential for the conservation of biodiversity in urban ecosystems. Through territorial mapping, the areas most prone to the development of this phenomenon are identified, analyzed with the aim of questioning what the future of "wild" nature in cities might be.