Entrance to Châtelet metro station, place Sainte-Opportune

1st arrondissement of Paris, France

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In the 1st arrondissement of Paris, this entrance to Châtelet metro station on place Sainte-Opportune exemplifies Hector Guimard's distinctive Art Nouveau style, which he developed for the Paris Métropolitain at the turn of the twentieth century. Like his other station entrances throughout the city, this structure showcases the characteristic organic forms and decorative ironwork that made Guimard's metro designs iconic emblems of early modernist architecture.