The Baroque Revival, also known as Neo-Baroque, was an architectural style of the late 19th and early 20th centuries. The term is used to describe architecture and architectural sculptures which display important aspects of Baroque style, but are not of the original Baroque period. Elements of the Baroque architectural tradition were an essential part of the curriculum of the École des Beaux-Arts in Paris, the pre-eminent school of architecture in the second half of the 19th century, and are integral to the Beaux-Arts architecture it engendered both in France and abroad. An ebullient sense of European imperialism encouraged an official architecture to reflect it in Britain and France, and in Germany and Italy the Baroque Revival expressed pride in the new power of the unified state.

Second Empire style, also known as the Napoleon III style, is a highly eclectic style of architecture and decorative arts, which uses elements of many different historical styles, and also made innovative use of modern materials, such as iron frameworks and glass skylights. It flourished in the Second French Empire during the reign of Emperor Napoleon III (1852–1870) and had an important influence on architecture and decoration in the rest of Europe and North America. Major examples of the style include the Opéra Garnier (1862–1871) in Paris by Charles Garnier, the Bibliothèque nationale de France, the Church of Saint Augustine (1860–1871), and the Philadelphia City Hall (1871–1901). The architectural style was closely connected with Haussmann's renovation of Paris carried out during the Second Empire; the new buildings, such as the Opéra, were intended as the focal points of the new boulevards.