I had heard of certain suburbs of big cities referred to as "bedroom communities" before I ever actually visited such a place. When I first did visit residents of such a suburb, I was very surprised to find that they lived in entire houses, and not just bedrooms.
A childhood belief about places

others believed things like this
- It never occured to me as a child that teachers lived in houses. I thought they lived at school...— Heidi, Pittsburgh, PA
- I heard the song about Heaven being a place where nothing ever happened and thought, "What a boring place."Anon
- i used to believe cars could fly, but only the rich had them in big cities. Thus, i never saw them.— kevin
- I always believed that we lived in Manchester (we didn't) but it was always the main place on the local news!— Richard M
- I used to believe that, in cities, if you dug deep enough in anyone's lawn, eventually you'd hit the concrete.— Kevin Fox
- I used to believe that london, paris, venice, and switzerland were all cities in France. — an american...