Napoleon III style
The Napoleon III style was a highly eclectic style of architecture and decorative arts, which used elements of many different historical styles,and also made innovative use of modern materials, such as iron frameworks and glass skylights. It flourished during the reign of Emperor Napoleon III in France (1852–1871) and had an important influence on architecture and decoration in the rest of Europe and the United States. Major examples of the style include the Opéra Garnier in Paris by Charles Garnier (1862–71), the Bibliothèque nationale de France. and the Church of Saint Augustine (1860–1871). The architectural style was closely connected with Haussmann's renovation of Paris carried out during the Second Empire; the new buildings, such as the opera, were intended as the focal points of the new boulevards.
Émile Zola
Most of the Rougon-Macquart novels were written during the French Third Republic. To an extent, attitudes and value judgments may have been superimposed on that picture with the wisdom of hindsight. The débâcle in which the reign of Napoleon III of France culminated may have imparted a note of decadence to certain of the novels about France in the years before that disastrous defeat. Nowhere is the doom laden image of the Second Empire so clearly seen as in "Nana", which culminates in echoes of the Franco-Prussian War (and hence by implication of the French defeat).Even in novels dealing with earlier periods of Napoleon III's reign the picture of the Second Empire is sometimes overlaid with the imagery of catastrophe.