In Vienna's 7th district, a massive reinforced concrete structure built during World War II has remained largely untouched for over 80 years. Known as the G-Turm tower of the Stiftskaserne, it was constructed in 1944 and stands 45 meters high. Designed by architect Friedrich Tamms, the tower was meant to both shoot down enemy aircraft and shelter up to 20,000 civilians during air raids. It is one of six Flak towers arranged in a triangle around the Saint-Étienne Cathedral, forming part of Vienna’s defensive network during the war. The tower is considered nearly indestructible, with walls up to 2.5 meters thick and a roof nearly 3.5 meters thick. Some parts of the structure may be even thicker. Located between active military barracks and, according to local legend, the site of a former school, the tower’s robust construction has made it extremely difficult to damage. Demolition efforts have been avoided due to the risk of harming nearby buildings. Rather than demolishing the structure, Austrian authorities have chosen to integrate it into the city’s landscape. Demolishing the G-Turm would risk damaging the surrounding neighborhood, and the tower is still considered a strategic asset, potentially serving as a shelter for leaders during a major crisis. The Flak towers, built between 1942 and 1945, were part of a broader defensive strategy as Allied bombings increased. The G-Turm was constructed using the "type 3" model, featuring a circular design with sixteen sides. Inside, the tower contains nine floors, an artillery platform, and a basement, making it a self-sufficient structure. The thick concrete walls and roof were designed to absorb and disperse the force of bomb explosions. Some of the other Flak towers in Vienna have been repurposed for public use, such as aquariums and climbing walls. The presence of these massive wartime structures raises questions about how societies deal with the remnants of history. In Vienna, the approach has been to incorporate these concrete giants into daily life, recognizing their historical significance while ensuring they remain part of the city’s landscape.