This is really cool. The Austrians are going to put on display the Tabula Peutingeriana for a limited time to celebrate it being include in UNESCO's "Memory of the World" list. The Tabula Peutingeriana is a medieval copy of an original Roman map of the known world covering Spain in the west as far as India to the east. Wikipedia have a nice article about it with an image of the entire map. Heres the west portion which shows Ireland, Britain, Spain and North Africa.
And this site here has the map in contrast to a modern Map.