For cartographers, having north at the top of a map is a convention, something that is assumed needs to be the case when creating a map. When convetions are broken, it causes us to think twice about what is happening and sometimes makes us see things in a different light. Upside Down maps have north at the bottom and south at the top and suddenly a county like Canada looks tucked away at the bottom of the map, far from the centre of the action. Curious how this happens.

The Upsided Down Map Page has a number of such maps and list of other resources.

By way of blog.kart.no.