Israeli youth wear the national flag while walking on the train track that carried Jews to their death at the entrance of the Nazi Germany Birkenau Concentration - Extermination Camp in Oswiecim, Poland, Thursday, August 1, 2019. Auschwitz-Birkenau was the largest concentration camp and functioned from June 1940 - January 1945. Historians estimate that 1.1 million people were murdered there. More than 2.1 million people visited Auschwitz last year. Photo by Debbie Hill/UPI