"It is a mansion built in 1580 for Sébastien Valtier de Choiseul by the Langres architect Nicolas Ribonnier. It was known as the Hôtel Valtier de Choiseul dit Du Breuil de St-Germain.
In 1923, Madame du Breuil de Saint-Germain handed over the building to the Historical and Archaeological Society of Langes with the condition that it be turned into a museum.
This building has become: La maison des Lumières, since it became a museum of France on October 5, 2013. It was inaugurated 300 years to the day after the birth of Diderot, the creator of the Encyclopedia.
It has ten rooms spread over 500 square meters. It is dedicated to Denis Diderot and his precursors, who initiated the Enlightenment movement.
On four floors and 400 m2 of exhibition space, 250 objects are presented in ten rooms. A bookstore devoted to the Lumières and Diderot completes the museum.
Four main themes are covered: the history of the building, Diderot's youth in Langres, his arrival and his life in Paris, his work and in particular the Encyclopedia. It is located at 1 Place Pierre Burelle in Langres."