The Duke and Duchess of Cambridge were shown harrowing scenes at the former Stutthof concentration camp in northern Poland on the second day of their official tour of the country today.
Stutthof was the first Nazi concentration camp set up in Poland in 1939, and was one of the last to be liberated in 1945.
During their visit, the royal couple met with senior staff from the institution - which is now run as a museum - and learned about the history of the 110,000 people who were imprisoned in Stutthof.
The pair appeared sombre as they were shown one of the camp's gas chambers, as well as the discarded shoes and personal items from Holocaust victims, and spoke to two survivors of the concentration camp, Manfred Goldberg and Zigi Shipper, both from North London.
Manfred and Zigi, both aged 87, then led a prayer at a Star of David memorial, where the Duke and Duchess paid their respects to those who lost their lives as a result of executions and horrendous living conditions.
Prince William spoke to one of the survivors about the importance of younger generations understanding the Holocaust.
'It is so important that myself and my wife Catherine and people of our generation learn about what happened here and places like this,' he said, The Evening Standard reports.
After their tour, the couple wrote a message in the museum's visitors book and said they were 'immensely moved' by the visit. They left Stutthof through what was known as the 'Death Gate' with survivors Zigi and Manfred.
Later today, William and Kate - who have just spoken about the possibility of expanding their brood - will travel to Gdansk town centre to experience a traditional Polish market before visits to the Gdansk Shakespeare theatre and and the port city's iconic shipyards.
On Wednesday - day three of the royal tour - they will begin the German part of the trip in the capital, Berlin.
