Before World War Two, the Jews made up a significant part of the population in Poland.

The German occupation of Warsaw, the Ghetto Rising in 1943, and deportations to the German death camps as part of the so-called "final solution to the Jewish problem" resulted in a massive loss of life.
Historical sources vary, but most estimate that around 3 million Polish Jews were killed between 1939-1945, including 1.9 million in the purpose-built extermination camps, like Auschwitz, Belzec or Treblinka.

You can still see evidence of this tragic legacy today, when you visit the Jewish Cemetery in Warsaw.
There are several hundred thousands graves there, with no families left to look after them.

A disconcerting and deeply moving place to visit.