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.
Napoleon III style
The industrial revolution was beginning to demand a new kind of architecture: bigger, stronger and less expensive. The new age of railways and the enormous increase in travel that it caused required new train stations, large hotels, exposition halls and department stores in Paris. While the exteriors of most Second Empire monumental buildings usually remained eclectic, a revolution was taking place inside; based on the model of The Crystal Palace in London (1851), Parisian architects began to use cast-iron frames and walls of glass in their buildings.