BBC NEWS | Europe | Ancient Roman road map unveiled
Detail from the Tabula Peutingeriana showing Rome on the right, represented by a crowned figure on a throne
The Tabula Peutingeriana is one of the Austrian National Library's greatest treasures.
The parchment scroll, made in the Middle Ages, is the only surviving copy of a road map from the late Roman Empire.
The document, which is almost seven metres long, shows the network of main Roman roads from Spain to India.
It is normally never shown to the public. The parchment is extremely fragile, and reacts badly to daylight. But it has been on display for one day to celebrate its inclusion in Unesco's Memory of the World Register.
Detail from the Tabula Peutingeriana showing Rome on the right, represented by a crowned figure on a throne