Confronting the entangled legacies of failed infrastructures, toxic materials, and compromised futures, this series opens up the concept of unbuilding as a critical lens for anthropological inquiry. Rather than treating decay, dismantling, or ruination as endpoints, we explore unbuilding as an active, often intentional, process through which past interventions are undone or repurposed. Drawing on ethnographic engagements from decommissioned power stations and corroding concrete to retrofitted tower blocks and unruly urban ecologies, the contributions develop a conceptual lexicon that attends to the material, political, and ecological demands of unbuilding. As a counterpoint to design, construction, and repair, unbuilding reorients attention to temporal disjunctures, material agency, and contested futures, revealing how acts of unmaking are themselves generative of new worlds.