By the end of the Gothic period, the French had created 80 cathedrals and tens of thousands of churches. But how did they lift stones weighing up to a ton to create their lofty spires? A team including a film set designer, a structural engineer and construction workers attempt - not without bitter argument - to re-create a medieval crane next to a Norman abbey.
click here to see where to watch or .
Ready to Watch Machines Time Forgot, Season 1, Episode 3?