Haussmann's renovation of Paris
Haussmann's renovation of Paris (known in French as the travaux haussmanniens, [tʁavo osmanjɛ̃], lit. 'Haussmannian works') was a vast public works programme commissioned by French Emperor Napoleon III and directed by his prefect of Seine, Georges-Eugène Haussmann, between 1853 and 1870.
Source: Wikipedia — Haussmann's renovation of Paris (CC BY-SA 4.0)