Around 1,500 artworks worth approximately one billion euros ($1.35 billion) were found in a dilapidated apartment in Munich. The shocking discovery was made public on Sunday, November 3 by the German news magazine, Focus. The trove includes works by celebrated impressionist and modern masters such as Henri Matisse, Marc Chagall and Pablo Picasso as well as Old Masters including Albrecht Durer.

The masterpieces, which were allegedly confiscated by Nazis or sold under duress by their Jewish owners, were found in the apartment of Cornelius Gurlitt, the son of the art dealer Hildebrandt Gurlitt, who reportedly acquired the works in the late 1930s and 1940s. Gurlitt’s father had been put in charge of selling the stolen artworks abroad by Joseph Goebbels, Hitler’s Minister of Propaganda, but secretly hoarded many of them and later claimed that they were destroyed in the bombing of Dresden. Gurlitt, an unemployed recluse, sold a number of the paintings over the years and lived off of the profits. 200 of the pieces have outstanding return requests from the original owners’ heirs.

In a shocking twist, it was revealed that officials have known about the looted artworks since 2011, when investigators searched Gurlitt’s apartment after he was caught by customs authorities on a train from Switzerland to Munich with a large amount of cash. Julian Radcliffe, chairman of the Art Loss Register, told AFP, “I think it’s the biggest find of Holocaust pictures that there’s been for years, but it’s still a tiny fraction of the total number of pictures that we’re looking for.” The works are currently being held in a customs warehouse outside of Munich.