The lack of borders within the EU’s Schengen area has its dark side as “Polish national masterpieces disappear without a trace,” laments Rzeczpospolita.

“Since WW II, Poland has been robbed of thousands of works of art which may never return,” reveals an art expert quoted by the daily.

According to a recent data, in the last 20 years more than 8,500 Polish works of art were stolen or smuggled out of the country.