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a few looneys from France decided one day to build their own, but to make it a scientific experiment for archeology. They decided to build it the way it was built in the XIII century.
Thus they needed to cut their own stones, and thus to cut them with the right tools, and thus to make the tools... and it all started with a village including the blacksmith, the quarryman.. et caetera.
But they will say it better : official site, in english
or :this one is in french but nice pics !
So, if any of you wants to go, you can visit or apply for voluntary help