century french architect named charles rohault de fleury. he set out to add all the pieces of the true cross. >> this map shows the places which he documented as having wood of the cross. and he worked out that all of this wood from all the places that he had been to didn't come up to 10% of the total volume needed to put up a cross of the size required to crucify christ. if rohault de fleury is right, calvin must be wrong. >> now kazan will use de fleury's map to help locate relics that his team can then carbon date. >> we would want to find relics subjecting these two scientific analyses to see just how much of the legend might be true. >> dr. kazan's hunt for churches that will grant him access to the true cross will take him