Second Empire Architecture is a style that emerged in France during the mid-19th century, characterized by its grand and ornate design. It is named after the reign of Emperor Napoleon III, who ruled from 1852 to 1870. This architectural style features distinctive elements such as mansard roofs, elaborate cornices, and decorative brackets, often incorporating a mix of classical and modern influences. The style became popular in the United States during the late 19th century, particularly for public buildings and homes. Notable examples include the New York City Hall and the Smithsonian Institution Building in Washington, D.C. Second Empire Architecture reflects the opulence and ambition of the era, showcasing a blend of functionality and artistic expression.