Tread Mill, Fortress Guedelon (Long-term Documentary), France, 2011 (13)Owner Reinhard Kungel Typ Video Id RKL006523experimenttourist destinationMiddle AgesYonneFranceGuédelon CastleBourgogne-Franche-ComtéTreigny2011High Middle Agescolorcastletourist attractionexperimental archaeologylong-term experiment13th century