William and Kate's visit to the 9/11 memorial in New York has made headlines around the world, helping keep the memory of that tragic day alive.
Nearly 3,000 people, including 67 Britons, lost their lives in the attacks 13 years ago.
ITV's Royal Correspondent Tim Ewart reports:
The Duke and Duchess of Cambridge visited the newly built One World Trade Center after their visit to the 9/11 memorial.
The tower, which at 1,792 ft is the tallest building in America, opened this year replacing the twin towers which were demolished in the 9/11 attacks 13 years ago.
William and Kate also visited youth development centre, The Door. to meet young people who have benefited from their training programmes.
The Duke of Cambridge was seen getting on a flight at LaGuardia Airport in New York heading to Washington.Read the full story ›
The Duchess of Cambridge said she was "moved" by her visit to the 9/11 memorial and being able to touch the names of those who died.
Kate, who signed her name alongside William's in a book of condolence, told the museum's chief of staff Allison Blais she was in awe of how big the museum was.
The memorial is for the 2,983 victims from 90 countries who died in the attacks 13 years ago.
The Duke and Duchess of Cambridge are pictured inside the 9/11 memorial museum, which opened to the public in May this year.
The attacks claimed the lives of 2,606 people in New York and 2,983 in total. The museum features photographs of the victims and various artifacts from that fateful day.
The Duke and Duchess of Cambridge laid a bouquet of flowers at the 9/11 memorial today during their visit to New York.
Kate lovingly placed the flowers down and made the sure the bow was tied around them.
The card read: "In sorrowful memory of those who died on September 11th and in admiration of the courage shown to rebuild."
Later the royal couple are due to visit the Empire State Building before hosting a ball.
It is expected to be a celebrity-studded event at the Metropolitan Museum of Art, better known as The Met.
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The Duke and Duchess of Cambridge met LeBron James, aka the "King of Cleveland," after the NBA game in New York, when the basketball star posed for pictures with the royal couple.
William and Kate were presented with two Cavaliers basketball vests - one bearing the name "Cambridge" and the other a junior version for their young son, with "George" printed on the back.
The Duke and Duchess met music's golden couple Jay Z and Beyonce at the NBA game in New York tonight.
Earlier the royals were broadcast on the big screen, to cheers from the crowd.
The Duke and Duchess of Cambridge Kate and William are attending an NBA game in New York tonight, following the Prince's speech at a wildlife reception.
The couple posed for pictures with NBA legend Dikembe Mutombo and William tried to get to grips with a new basketball trick.