Guédelon or the castle of Guédelon is a medieval building site of a historic castle built in 1997, according to the techniques and materials used in the Middle Ages.
This architectural project located in Treigny in the Yonne, in a former quarry abandoned in the center of a forest and close to a pond, about thirty kilometers southwest of Auxerre, aims to improve knowledge in castellology and In experimental archeology. While developing a reflection of the type "art and folk traditions", it stages in a real unfolding, the construction of a monumental program, which differentiates it from the theme parks.