The real treat turned out to be Lepenski Vir, located in the Derdap National Park. The age of this prehistoric settlement is estimated at 5-6 thousand years B.C. I was most impressed by the stones with carved human heads with astonishingly accurate facial expressions, standing in each house. They are the oldest Mesolithic carvings on the continent. Sightseeing was a bit spoiled by an attack colic, but thanks to the help of a young couple from Ukraine, I managed somehow.