Went to a camping in the Laurentians in Québec (Ste-Agathe) and there were those things near some camp sites. The sites are only accessible by footpaths. No car access. And if you bring a bike, you have to walk it up a hill, so I doubt they are bike racks.
EDIT: I have sent an email to the park and they have been kind enough to reply. It's just a type of fireplace with a grate. They didn't give more info than just this. Thanks to everyone for pitching in!
It looks like a park but it's a municipal camping with a forested area for tents. I will ask the employees when I go back, but I'm afraid they may also not know. I'm also tempted to call and ask directly but this gives me a reason to make another cycling trip "in the north".
how can I make sure to not miss the update??
I hope you'll post what you learn as a new message in this community, so we all see it.
updated