I used to believe that state lines were actually marked out on the ground somehow - that is, the whole borders of the states all around. I lost this notion pretty quick the first time we took a long car trip :-)
A childhood belief about places

others believed things like this
- I grew up in Hawaii, and was pretty sure that our country, the United States, was the fiftieth stateAnon
- I used to think that the lines outlining each of the states found on a US map were really there.— Anna
- I used to believe that China was attached to the United States somewhere up near Washington state.Anon
- I used to believe that America was one of the states of the United States.— Limor
- I used to think that if you went to the end of a road marked "Dead End", somebody would try to kill you.— Spooky
- I got given a box of slime marked "alien puke" and asked if E.T. was all right.Anon