Underneath the foundations of the newly constructed Polish National Stadium rest the wreckage that was removed from the city after the destruction of Warsaw during World War Two. The opportunity to contribute to the design and realization of a new landmark for the Capital and the Polish Nation on such historical grounds was an extraordinary honour for us. The realization of this arena, working in conjunction with designers and companies from Poland, Germany, Italy and Switzerland established a milestone, technically and functionally. It necessitated the development of innovative solutions in response to new engineering challenges, many of which had not been encountered before. The design of this expressive multifunctional arena with a retractable inner roof above the green field, suitable even for winter, and the realization of an efficient structure with moveable components resulted in various interesting engineering tasks. This article shall give insight into some of these topics and the way they have been dealt with.