Great photo of the roof area! Look at this video and at 1:13 minutes in you will see similar wooden walkways in another roof area of the Cathedral. Or some upper area of the same. Lots of good kindling there, especially if take apart some of the wooden railing and assemble into a campfire
THIS VIDEO -— https://www.youtube.com/watch?v=TChw7NyOn8E SAME WOODEN WALKWAYS ARE SEEN.
BTW your photos is of the roof area of ________
la_cathedrale_de_coutances_
https://en.wikipedia.org/wiki/Coutances_Cathedral