In the last post was the picture of the gate to the synagogue, as you pass through the gate and a courtyard your are face to face with this Jewish cemetery.
The rocks place on the graves are placed in the Jewish faith to express memory and memorial to that person or persons. In the States we will place flowers at the grave on a anniversary to remember. One thing about the rocks is how sustaining they are in their remembrance.

In the next picture you are seeing the wall around the cemetery and synagogue. Many times the Nazis would take the heads stones from Jewish cemeteries for other purposes. Like building a wall. You can see some partial head stones used to help build this wall.