Oh, right, so what we call Antarctica is actually just a huge ice wall. Well since no one's actually SEEN anyone ever actually fly off the edge of the world, and there's labs in Antarctica, along with explorers visit Antarctica, and no one's ever reported such a claim, I'd say it's safe to say that the world isn't flat, or that that ice wall is at another location.
EDIT: Also, if the world is flat, wouldn't it be possible to launch space craft from said ice wall?