Rosa Bonheur- Château de By Leave a Comment / Uncategorized / By admin Salon de thé. Atelier of Rosa Bonheur. Rosa’s Bonheur piano. The Château de By, otherwise the Musée de l’atelier Rosa Bonheur is a museum in Thomery in the department of Seine-et-Marne in Île de France.From Paris Gare de Lyon the train R to the station Thomery. From the train station is 20 minutes walking time to the castle.The castle dated from the 15th-century.The castle was bought by the famous painter Rosa Bonheur in 1859. She was known as a painter of animals (animalière), she has also made sculptures in a realist style. Every year the festival Rosa Bonheur Rosa Bonheur herself.