Chantier Médiéval de Guédelon is 45km southwest of Auxerre and 7km southwest of St-Sauveur-en-Puisaye. A team of skilled artisans, aided by archaeologists, has been hard at work building a fortified castle here since 1997 using only 13th-century techniques. No electricity or power tools here: stone is quarried on site using iron hand tools forged by a team of blacksmiths, who also produce vital items like door hinges. Clay for tiles is fired for three days using locally cut wood and the mortar, made on site with lime, is transported in freshly woven wicker baskets. A very worthwhile guided tour, sometimes in English, costs €2.50 per person. Wear closed shoes, as the site is often a sea of muck. Child-oriented activities include stone carving (using especially soft stone).