ArchitectAugust Sicard von SicardsburgAustrian architect (1813-1868), 1813–1868Photograph of one of their buildings · P e z i · CC BY-SA 3.0 at · Wikimedia Commons2 buildingsAustriaFurther readingWikipedia article↗BuildingsCarltheaterVienna, AustriaVienna State Opera houseInnere Stadt, Austria