This lecture is about renovation of Paris in 1890s.
The renovation was a vast public program commissioned by Napoleon the third and directed by Haussmann.
Napoleon the third instructed Haussmann to bring air and light to the centre of Paris and to drain the sewage.
He also asked Haussmann to plant more trees, build roads and to make the city safer.
The reason for doing this was the old Paris had many serious problems such as overcrowding, diseases and crimes.