The Shoes on the Danube Holocaust memorial is made up of 60 pairs of iron sculpted shoes that honor the Jews who were executed by the river Danube in World War II. The Jews were told to line up facing the river, take their shoes off and then shot to death in broad daylight by the Nazis to terrorize both Jews and supporters of Jews. The bodies were carried away by the water, the river cleaned up the mess, and the shoes were re-sold on the black market. It’s a gut-wrenching memorial and very effective.