The cantilever construction of prestressed concrete bridges is emblematic of the technical progress and structural art of the post-war era. Examples such as the Lahn Bridge in Balduinstein (1950–1951), the Nibelungen Bridge in Worms (1951-1953), or the lesser-known Neckar Bridge in Neckarrems (1951–1952) not only mark milestones in construction history but also reflect the social and technological challenges of that era. Today, modern diagnostic and monitoring methods open new possibilities for preserving these culturally significant engineering structures beyond their originally planned service life. The example of the Nibelungen Bridge demonstrates how innovative approaches, combined with interdisciplinary collaboration between building authorities, historic preservationists, planners, and scientists, can lead to sustainable preservation strategies. This article spans the historical development of prestressed concrete bridge cantilever construction, through modern, research-based methods of structural maintenance, to the essential role of close cooperation among all stakeholders in preserving prestressed concrete bridges as testaments to the development of building culture in the long term.