ArchitectChristoph H. MäcklerGerman architect, 1951Photograph of one of their buildings · OpernturmVoll.jpg: Adornix derivative work: Dontworry · Public domain · Wikimedia Commons3 buildingsGermanyBuildingsOpernTurmFrankfurt, GermanyZoofensterCharlottenburg-Wilmersdorf, GermanyTower 185Frankfurt-Innenstadt I, Germany