(JTA) — 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.

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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.”