Information: Wikipedia

A Stolperstein literally "stumbling stone", metaphorically a "stumbling block" is a sett-size, 10 by 10 centimetres (3.9 in × 3.9 in) concrete cube bearing a brass plate inscribed with the name and life dates of victims of Nazi extermination or persecution.

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 he or she fell victim to Nazi terror, euthanasia, eugenics, was deported to a concentration or extermination camp, or escaped persecution by emigration or suicide. As of 29 March 2018, over 67,000 Stolpersteine have been laid in 22 countries, making the Stolpersteine project the world's largest decentralized memorial.

The majority of Stolpersteine commemorate Jewish victims of the Holocaust. Others have been placed for Sinti and Romani people (then also called "gypsies"), homosexuals, the physically or mentally disabled, Jehovah's Witnesses, black people, members of the Communist Party, the Social Democratic Party, and the anti-Nazi Resistance, the Christian opposition (both Protestants and Catholics), and Freemasons, along with International Brigade soldiers in the Spanish Civil War, military deserters, conscientious objectors, escape helpers, capitulators, "habitual criminals", looters, and others charged with treason, military disobedience, or undermining the Nazi military, as well as Allied soldiers.

Grave, 5 February 1880 – Sobibor, 16 April 1943 Reached the age of 63 years

Dina van Leeuwen, born in 1880, worked in her brother Levie's butcher's shop until his death in 1941. In 1943, the municipality of Grave was ordered to 'remove all Jews from the province'. Dina leaves with a suitcase and two coats on, because she says 'it could be cold in the German camps'. Four days after arriving in Westerbork, she was deported to Sobibor and immediately killed on the day of arrival, April 16, 1943.

Grave, 9 September 1861 – Auschwitz, 27 August 1943 Reached the age of 81 years

Nathan Gotlieb, born in 1861, was the father of two sons and the owner of a drapery shop in Rogstraat 4. In September 1942, after the death of his wife, he left for the Joods Rustoord in Oss. From there he was deported to Westerbork on 14 August 1943. Shortly afterwards he was deported to Auschwitz where he was murdered on arrival on 27 August.