They began construction of the Palais Garnier for the Paris Opera and built two new theaters at the Place du Châtelet to replace those in the old theater district of the Boulevard du Temple, known as "The Boulevard of Crime", which had been demolished to make room for the new boulevards. They completely rebuilt the central market of the city, Les Halles, built the first railway bridge over the Seine, and also built the monumental Fontaine Saint-Michel at the beginning of the new Boulevard Saint-Michel. They also redesigned the street architecture of Paris, installing new street lamps, kiosks, omnibus stops and public toilets (called "chalets of necessity"), which were specially designed by the city architect Gabriel Davioud, and which gave the Paris boulevards their distinct harmony and look.[125]