Monument Unveiled To Remember Buried Warsaw Ghetto Archive By Bernard OSSER 04/19/21 AT 1:18 PM A new monument unveiled in Warsaw on Monday consisting of a glass cube above an underground chamber commemorates the extraordinary history of a Holocaust-era archive hidden by Jewish volunteers. The sombre memorial has been erected on ground now surrounded by Soviet-era buildings where the trove of documents about life and death in the Warsaw Ghetto was buried in total secret in 1942. Inside the cube is a page from the archive -- a handwritten will by 19-year-old Dawid Graber, one of the volunteers who helped hide the documents from the Nazis.