Exposition of Jelgava St. Trinity Church Tower is designed as a contemporary interior installation, which clearly separates the historical heritage from the contemporary implementation. The exposition is interactive and integrates the latest technologies, which allows the history of Jelgava to be revealed gradually. When entering the exposition premises, visitors can see the exhibits and their descriptions, while the invisible part of the exposition is hidden in various mechanically movable elements and multimedia. Such a principle of exploring the exposition allows not only to create a space not oversaturated with information, but also makes visitors interested in seeing the invisible, hearing the inaudible, feeling the lost Jelgava.