Yeah, def not radiator covers. Can't figure it out...

Pedestals for statues?

I have no idea but am really curious. Hope you get an answer!

Yes, I am starting to think they might be decorative, and maybe the original owner had statues or some sort of artwork in mind?

I guess that's a possibility. Are they very deep? Just wondering why they don't double as some type of cabinet.

Curious! If you have an IR camera you might take there heat signature. My best guess is that they are enclosing some kind of foundation element. It must be something immoveable if the carpet is cut around it. Is there a vent or something on the exterior?

There is nothing on the outside, just red brick wall and a flat patio foundation. Wish I had an IR camera! I did knock on them and couldn't tell anything from that (not that I knew what I was listening for!). They are about 11 inches deep.

househaven, did you ask anyone when you moved in? They've got to be hiding something and/or decorative. Geez...really curious!

We moved from a tiny studio rental so we were blinded by all the space and didn't have the homeowner commonsense to ask! Haha. Now I just stack the kids' boardgames, cardboard bricks, etc., on them so I don't even notice them anymore.

Yes...pretty easy to get to that not noticing stage! When we moved into our house 3 years ago there were intercom "vents" all over the place. However, not a control panel/station to be found. Just assumed it was possibly covered up at one point. Still a mystery!