I hope someone did a 3D scan of the entire structure. Seems likely someone would have.
The Photosynth TED talk uses Notre Dame as an example of reconstructing geometry from a random selection of photos.
https://www.ted.com/talks/blaise_aguera_y_arcas_demos_photos...
Skip to 3:45 or so.
Microsoft canned Photosynth and seemed to make very little effort to preserve all the content.
Google is especially guilty of this.
https://sketchfab.com/3d-models/portail-notre-dame-de-paris-...
https://www.youtube.com/watch?v=-nwEFCBLrdk
Its going to feel a little bit different building one of these now.