I used to think a yeoman meant Yemen and Oman.
I used to think everyone had to be born in the country that they were ethnically from or related to their accent.
After hearing the phrase "time is money" I used to believe that money and time were essentially the same thing. So since 60 seconds equaled one minute, I thought 60 cents were equal to a dollar.
I used to believe that the borders of countries would have actual "lines" or "walls" on the ground to signify that you were entering a new country.
When I was a child I used to believe that when air balloons were in the sky they made a route going through all the cities. When I was four years old I had a balloon and it escaped from my hands, and I called my uncle to see if he saw the balloon in the sky from Barcelona
When i was a kid i thought New York was in London
My younger sibling thought that Brittany was the name of the country where British people lived
I used to believe that everyone who lived in the city lived in an apartment.
I used to believe that Eurostar trains actually went through the water, rather than being built in a tunnel, and thought there must be a station underwater for when people went diving!
I used to believe that Cuban people were made out of cubes