On the banks of the Danube River, just outside the Bulgarian town of Svishtov, lie remains of what once was one of the few great legionary fortresses along the border of the Roman Empire: Novae, a part of the so called limes Moesiae - defence lines - which followed the course of the Danube.
The fortress is one of a few along the limes to have been excavated.
Elena Klenina of the Adam Mickiewicz University in Poznań, head of Centre Expedition Novae is talking to Elżbieta Krajewska.