This paper presents a comparative structural analysis of three historically significant medieval churches in Transylvania, Romania, each exemplifying a distinct structural concept: (a) the basilica-type Reformed Church in Sic (Cluj County), (b) the single-nave Reformed Church on Wolves’ Street in Cluj-Napoca, and (c) the hall-type St. Michael's Roman Catholic Church, recent recipient of the 2024 Europa Nostra Award. The paper aims to present, in a scholarly manner, the results of object-based research and design, and to highlight the importance of information gathered during execution, as practitioners in built heritage restoration rarely communicate their results through academic channels. Using a combined methodology of historical-architectural survey, detailed damage assessment, and computational static modeling, the study evaluates the seismic vulnerability and load-bearing behavior of these masonry superstructures. Archival data and past intervention records were reviewed, and current structural conditions were analyzed through finite element modeling to simulate earthquake scenarios. The principal findings reveal that both the durability and reliability of these structures exceed the levels typically predicted by evaluations conducted according to modern engineering codes. The analysis highlights the limitations of past interventions and demonstrates the importance of adaptive, minimally invasive seismic strengthening that respects the historical load-bearing system. Beyond case-specific recommendations, the study contributes to a broader understanding of how computational modeling can inform preservation-oriented engineering decisions for Gothic masonry structures, while insights gained from the behavior of historic buildings can, in turn, help refine contemporary engineering tools.