well, this belief persisted into high school, until I was humiliatingly corrected in a history class, but since I'm STILL a kid I think it counts... I used to believe that Walt Whitman (poet) and Charles Whitman (guy who shot people from the tower in Austin TX) were the same guy, that later in life Walt Whitman went nuts and went up in that tower and shot everybody, and that this tower was called the ALAMO, and that's why they said "remember the Alamo", like "remember that time Walt Whitman went up in that tower and shot all those people?"
A childhood belief about history

others believed things like this
- i used to think the water tower was filled with milk— jen
- I used to believe that Jesus lived in the tower of the churchAnon
- i used to believe that humpty dumpty lived in our towns water towerAnon
- When I was a kid I always thought that a water tower was the robot from the TV show "Lost in Space".— sherryj
- I used to wonder why they didn't fix the Leaning Tower Of Pisa. Weren't they embarrassed that it was crooked?— Bootlebat
- I used to believe the large metal structure in Paris, France, I thought it was the "Eye Full Tower"— Janet