The exhibition is dedicated to a rare sound monument in the urban environment - a bell tower, where the traditional belfry, carillon, and clock are combined. The project shows how technologies and the urban landscape have changed, while the bell voice continued to sound alongside everyday life. The history of the bell tower is revealed as a cohesive sound narrative. The materials of the exhibition help to imagine how in the 18th century the bell complex was created, uniting Russian tradition with European innovations. The tower featured familiar bells that accompanied worship services and an overseas novelty - the carillon. From fires and reconstructions of the spire to restorations and updates - each stage left a mark on the fate of the bell tower. It is shown that the ringing levels conceived in the 18th century have survived to this day: Russian bells from the early last century, historical clock chimes, and the modern carillon installed a quarter of a century ago. Through documents, photographs, and objects, it is evident how mechanisms changed, but the sense of solemnity associated with the bell sound did not disappear. A separate section is dedicated to the sound landscape of the city. The bell ringing is presented as part of the urban rhythm and a time marker. The multimedia program introduces other bell towers, demonstrating how different cities create their recognizable sound. The exhibition is structured so that the viewer can trace the path from the first bells to the modern carillon and feel how the sound history of the cathedral resonates with ideas of beauty and memory. The exhibition takes place at the Engineering House of the Peter and Paul Fortress. Where to go in St. Petersburg, we tell on our website.