Haussmannization was a vast public works program commissioned by Emperor Napoleon III between 1853 and 1870, directed by Baron Haussmann. It involved renovating Paris by clearing slums, installing wide boulevards, rebuilding markets and parks, and building new water supply and sewage systems. This modernized Paris and changed it from a medieval city with cramped and crowded streets to a city with orderly planning and design. The renovations displaced many poor residents but created green spaces and infrastructure improvements, resulting in a more beautiful and healthy Paris that still exists today.