Georges-Eugène Haussmann was tasked by Emperor Napoleon III to modernize Paris in the mid-19th century. Haussmann razed crowded, diseased neighborhoods and replaced them with wide boulevards and parks to improve sanitation, traffic flow, and military control of the city. He built a modern sewer system and standardized neoclassical facades. While Haussmann's renovation beautified Paris and ended disease epidemics, it displaced many residents and destroyed historic areas, generating much controversy.