Stolperstein

A Stolperstein is a ten-centimetre concrete cube bearing a brass plate inscribed with the name and life dates of victims of Nazi extermination or persecution. Literally, it means 'stumbling stone' and metaphorically 'stumbling block'.

The Stolpersteine project, initiated by the German artist Gunter Demnig in 1992, aims to commemorate individuals at exactly the last place of residency – or, sometimes, work – which was freely chosen by the person before they fell victim to Nazi terror, forced euthanasia, eugenics, deportation to a concentration or extermination camp, or escaped persecution by emigration or suicide. As of December 2019, 75,000 Stolpersteine have been laid, making the Stolpersteine project the world's largest decentralized memorial.The majority of Stolpersteine commemorate Jewish victims of the Holocaust.

Source: Wikipedia