Source 6. Map of Paris, 1850 - 1870





Source 2. typical Parisian street, c. 1850





Map of Paris, circa 1790





Source 7. Completion of the Avenue de l'Opera, 1876 - 1877





Source 8. Clearing of old neighbohoods for the Avenue de l'Opera, 1876





Source 1. Vienna circa 1850, Note glacis





Source 4. Viennese Ringstrasse.





Source 14. Buttes-Chaumont Park, Paris





Map of Paris, circa 1790 - Buttes-Chaumont Park in red





Source 13. The Prater, Vienna





Working class housing, Parisian suburb





Working class housing, Vienna





Karl Marx Hof, Vienna, 1927-1929