800,000 were murdered at the Treblinka Extermination and Workers Camps. We do not have any official records of where Frieda, Otto, and Ruth were murdered. Based on historical accounts, our best guess is that they were sent to Treblinka.
Words cannot express our visit here. Below are a few pictures of the site and memorial.
The stones represented the edge of the extermination camp.
The railroad was removed and replaced by this memorial
Over the pits where 800,000 are buried, are tens of thousands of stones
This monument stood at the entrance of the camp, behind it was a pit full of black granite to represent the ashes