I always believed that the White House was in Pennsylvania, because it sits on Pennsylvania Avenue. I didn't learn until recently (at an emberassing age I won't mention) that the capitol is in Maryland.
A childhood belief about places

others believed things like this
- I used to think Dracula was from Pennsylvania.Anon
- I used to believe that the Lehigh tunnel in Pennsylvania was created by Superman.— Holz
- I used to think the entire state of Pennsylvania was made out of pencils.— Pencil-vania
- When I was little i believed that Madison Avenue was a person.Anon
- I recently very disturbed to learn that Al Jolson was in fact Caucasian.Anon
- Maryland was actually a huge amusement park, i.e. Merry-Land, like Disneyland. — Julianne