ArchitectErnst Friedrich ZwirnerGerman architect (1802–1861), 1802–1861Photograph of one of their buildings · Thomas Wolf, www.foto-tw.de · CC BY-SA 3.0 de · Wikimedia Commons5 buildingsKingdom of PrussiaFurther readingWikipedia article↗BuildingsCologne CathedralCologne, GermanyGlockengasse SynagogueAltstadt-Nord, GermanySchwerin CastleSchwerin, GermanySt. MarienWitten, Germany