The Haussmann Plan was a massive urban planning intervention in Paris from 1852-1870 led by Napoleon III and urban planner Georges-Eugène Haussmann. The goals were to modernize the city, improve sanitation and transportation, and make it easier for the government and military to control. This involved demolishing narrow, irregular streets and replacing them with wide boulevards and squares connected by broad, straight avenues. The plan displaced many working class residents but consolidated the bourgeoisie's dominance and transformed Paris into a modern, hygienic and orderly city. However, it was also very expensive and criticized for destroying the city's historical character and isolating residents.