A long time ago, my hometown library had old National Geographics laid out for the taking by anyone who wanted one. I grabbed quite a few that had stories and pictures that interested me. I also picked up a few at other places I don't now remember. (Those I didn't toss when we moved over the years are currently in my mom's basement.)
One of them had a story about Notre Dame and the islands of the Seine. After the fire, I did some Googling to see if I could find out which issue that story was in and if that issue is available online. Unfortunately NG's archives require paying for an account. So I emailed my public library and asked if they had any deals for patrons. They don't, but the librarian who answered me asked for details and found the story, which National Geographic has placed online due to the fire. How convenient!
So
here is the story with pictures from May of 1968.