A treasure hunter from Poland discovers an American Sherman tank, a French sword, and a Prussian helmet.
Scholar: How did over 1,100-year-old silver coins end up in a cornfield in northeastern Poland?
He has been on the lookout for them for ten years.
A Polish archaeologist is leading the investigation into the origins of silver coins discovered in Paris.
They are thought to date from the city's siege in 845 by an invading Viking army, he says.
In 845, Vikings extorted a large ransom from Charlemagne in exchange for sparing Paris.
Near Biskupiec, Poland, the Vikings had a major trading post
