Maison de Verre by François Halard
Maison de Verre, The Best House in Paris:

No house in France better reflects the magical promise of 20th-century architecture than the Maison de Verre. Tucked behind the solemn porte-cochere of a traditional French residence on Rue Saint-Guillaume, a quiet street in a wealthy Left Bank neighborhood, the 1932 house designed by Pierre Chareau challenges our assumptions about the nature of Modernism. For architects it represents the road not taken: a lyrical machine whose theatricality is the antithesis of the dry functionalist aesthetic that reigned through much of the 20th century.
Its status as a cult object was enhanced by the house’s relative inaccessibility. For decades it was seen only by a handful of scholars and by patients of a gynecologist whose offices took up the first floor. Later it was mostly used as occasional guest quarters for friends of the doctor’s family, who had long since settled into a traditional 18th-century apartment across the courtyard.

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Maison de Verre, The Best House in Paris