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!
Vertical Rack for storing clay tool molds. Keep an eye out for a friendly seraph. They're clearly in the iron age at this point.
I definitely did not expect a wholesome vintage story reference here. Thank you for the smile, kind person.