The Château de Grignan is a historic castle located in the Provence region of southeastern France. Originally built in the 11th century, it has undergone several renovations, particularly in the 17th century, when it was transformed into a grand residence. The castle is known for its stunning architecture and beautiful gardens, offering picturesque views of the surrounding landscape. Today, the Château de Grignan serves as a cultural site and museum, showcasing the history of the region and its connection to notable figures, such as Madame de Sévigné, who frequently corresponded with her daughter about the castle. Visitors can explore its elegant rooms and learn about its rich heritage.