ArchitectKarol KozłowskiPolish architect, 1847–1902Photograph of one of their buildings · Wistula · CC BY-SA 3.0 · Wikimedia Commons2 buildingsCongress PolandBuildingsGmach Filharmonii NarodowejWarsaw, Polandkamienica przy ulicy Wilczej 22Śródmieście, Poland