Here is a story about the Tabula Peutingeriana which is a copy of an ancient Roman roadmap of Europe. It is not on display due to its fragility and light sensitivity, however, it was displayed for one day as part of Unesco's Memory of the World Register (http://news.bbc.co.uk/2/hi/europe/7113810.stm). The map is almost a linear East-West mapping of important roads and destinations across Europe and Asia.
Wikipedia has a good entry (http://en.wikipedia.org/wiki/Tabula_Peutingeriana) including a high resolution facsimile that can be downloaded.