The image embedded on the Monument wall (next to the blue information panels) depicts a road near the site of the former Mauthausen concentration camp, built in 1938.
Eliminating the Jewish people was such a fundamental aspect of the Nazi ideology, that in 1945, when everything around them was crumbling and the Third Reich was on the verge of military defeat, the Nazis were still investing resources to move the Jewish prisoners out of the camps.
In April 1945, tens of thousands of sick and weakened Jewish prisoners were forced to walk for days and weeks through winter weather with little food, inadequate clothing and no shelter. Those who could not keep up were shot and left in roadside ditches. The survivors eventually ended up at Mauthausen or the nearby camp at Gunskirchen before being liberated by the Allies.