American pop star Katy Perry visited the site of the Auschwitz-Birkenau Nazi death camp. Perry, 30, visited the site Wednesday after performing the previous night at the Krakow Arena in Poland as part of her Prismatic World Tour. My heart was heavy today. For ever let this place be a cry of despair and a warning to humanity, where the Nazi murdered about one and a half million men, women and children mainly Jews from various countries of Europe. Auschwitz - Birkenau 1940-1945 'The one that does not remember history is bound to live through it again' George Santayana A photo posted by KATY PERRY (@katyperry) on Feb 25, 2015 at 2:01pm PST She posted a photo of the prisoner barracks on Instagram with the caption, “My heart was heavy today.” Perry also quoted from the memorial plaque at the site and added a quote from Spanish-American writer George Santayana: “The one that does not remember history is bound to live through it again.”