The Duke and Duchess of Cambridge visited the former Nazi concentration camp of Stutthoff, near Gdansk on Tuesday, where 65,000 people were killed during World War II.

Britain’s Prince William and Catherine, Duchess of Cambridge spoke with Holocaust survivors Manfred Goldberg and Zigi Shipper and signed the visitor book of the former camp. Goldberg and Shipper met in a subcamp of Stutthof and today speak in schools throughout Britain about their experiences.

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Reports said the royal couple were visibly moved by what they saw, including displays with piles of shoes that had belonged to camp inmates and gas chambers where inmates were killed. They placed stones at the camp’s memorial to its victims, a Jewish custom.