Château de Franconville-aux-Bois, Historical castle in Saint-Martin-du-Tertre, France.
Château de Franconville-aux-Bois is a listed historic monument and château in Saint-Martin-du-Tertre, north of Paris. It features a main building with stone facades, decorated cornices, and pediments, set within grounds that include an orangery.
The château was designed and built between 1876 and 1882 by architect Hippolyte Destailleur for the Duke of Massa. During World War I it was turned into a military hospital, marking the beginning of a long period of medical use.
Inside the château, a theater modeled on the style of the Grand Theater of Bordeaux once served as a concert hall during large gatherings. The stage and seating area are still visible today, giving a sense of how the building was used for entertainment.
Access to the site requires advance arrangements, as it is not freely open to the public. Those interested in the building's history can consult the Heritage and Photography Media Library in Charenton-le-Pont, where archival documentation is available.
From 1929 to 1992, the building served as a tuberculosis sanatorium with capacity for around 500 patients. Decades of use as a medical facility changed the interior layout of the château in ways that are still noticeable today.
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