The Château de Pierrefonds is a historic castle located in the Oise department of northern France. Originally built in the 14th century, it was later restored in the 19th century by the architect Eugène Viollet-le-Duc. The castle features impressive towers, a large keep, and beautiful gardens, showcasing a blend of medieval and romantic architectural styles. Surrounded by lush forests, the château has served various purposes throughout its history, including a royal residence and a military stronghold. Today, it is a popular tourist attraction, offering visitors a glimpse into French history and architecture, as well as stunning views of the surrounding landscape.