Pierrefonds is a charming town located in the Oise department of the Ile de France region in northern France. The town is best known for its stunning Château de Pierrefonds, a medieval castle that was restored in the 19th century by the famous architect Eugène Viollet-le-Duc. The town itself is picturesque, with narrow cobblestone streets, historic buildings, and a peaceful atmosphere. The surrounding countryside is lush and green, with rolling hills and forests, making it a popular destination for outdoor activities such as hiking and cycling.