What if the world IS flat ?

Look at " Education" , "you must believe this because it is the truth", if people said the world is flat hundreds of years ago..... wouldn't " hundreds of years " be enough time to change that fact by imposing your views on to people ??? And what Evidence do we have that it is round ? pictures from NASA ? How did people know the world is round before space travel ?? what if the world is a never ending sheet of rock in "space" but humans are confined in one little segment ?? not allowed to interact because of our destructive ways ??