Small plasterer town glued to the hillside, nothing predestined Villetaneuse to be the city it has become. Since the 20th century, it has metamorphosed, multiplying its population by fifteen and calling on utopian and ambitious architects. Along the way, discover the rich but unknown architectural and natural heritage of Villetaneuse: its university, its emblematic housing complexes, its worker gardens, its new city center, its landscaped cemetery, etc. We discover disappointed dreams of development, the persistence of a working culture, surprising infrastructures and unsuspected pockets of biodiversity. Inside, it is an emblematic and sensitive portrait of the Seine-Saint-Denis that draws the urban trajectory of Villetaneuse: between geographical constraints, industrial past and pioneering architectures.