World War II looting of Poland

The looting of Polish cultural artifacts during World War II was carried out by Nazi Germany and the Soviet Union side by side after the invasion of Poland of 1939. A significant portion of Poland's cultural heritage, estimated at about half a million art objects, was plundered by the occupying powers. Cataloged pieces are still occasionally recovered elsewhere and returned to Poland.

Priceless pieces of art still considered missing or found in Russian museums include works by Canaletto, Anna Bilińska-Bohdanowiczowa, Józef Brandt, Lucas Cranach the Elder, Lucas Cranach the Younger, Albrecht Dürer, Anthony van Dyck, Hans Holbein the Younger, Jacob Jordaens, Frans Luycx, Jacek Malczewski, Raphael, Rembrandt van Rijn, Peter Paul Rubens, Henryk Siemiradzki, Veit Stoss, Alfred Wierusz-Kowalski, Leon Wyczółkowski, Jan Matejko, Henri Gervex, Ludwig Buchhorn, Józef Simmler, Henri-Pierre Danloux, Jan Miense Molenaer and many others.

...
Wikipedia