At my parents' house I could never put magnets on the fridge door because it was lined with a thin sheet of wood to match the kitchen furniture.
Oh, you are right about those "hidden" fridges! So much space wasted behind the "secret" door... :)
Nice collection of magnets! I like how you divided them into categories... :)
My squared mind made me categorise them, I have no remedy for that... 😂
Panelled refrigerator doors were a fashion of the time when we moved from neighbourhood. The incredible thing is that that refrigerator continues to work more than 25 years later. 😱