These memorial stones (so called Stolpersteine of stumbling blocks) commemorate:
Henriette Sommer (born 1873, murdered in Theresienstadt)
Seligmann Sommer (born 1872, murdered in Treblinka)
Helene Sommer (born 1877, murdered in Treblinka)
The small brass plaques, in the pavement in front of houses of which the (mostly Jewish) residents were murdered by the Nazis, mention the name, date of birth and place (mostly a concentration camp) and date of death.
In many other cities, mainly in Germany but also in other European countries, the memorials also can be found. There are already many thousands of these plaques and their number is still counting. Almost all Stolpersteine are laid by the German artist himself, Gunter Demnig.
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