Harry and Meghan have visited the One World Trade Centre in New York on their first visit to the city together as they joined the campaign for vaccine take-up.
The Duke and Duchess of Sussex are taking part in the Global Citizen Live event at the weekend, which is urging world leaders to commit to greater vaccine equity.
It comes just ten days since the city marked the 20th anniversary of the 9/11 terrorist attacks.
Their New York visit began at the observatory deck on the 100th floor of the Freedom Tower.
It's the first time the couple have been on a public engagement together since announcing the birth of their daughter, Lilibet Diana.
They also visited the 9/11 Memorial on the site of the Twin Towers which were destroyed in the mass attacks.
They paused at the list of the names of those killed in September 2001 which have been inscribed around the edges of the large pools which were built in the footprints of the former buildings.
Harry and Meghan also entered the 9/11 Museum which is located underneath.
It's their biggest public trip together since they left the Royal Family in 2020 and moved to California.
The Sussexes were joined by the Mayor of New York City, Bill de Blasio and the State Governor, Kathy Hochul.
Meghan said it was "good to be back" in New York.
The last time she was in the city was for the baby shower she held here with close friends shortly before the birth of the couple's first son Archie.
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On Saturday, in Central Park, the Global Citizen concert will call on the wealthiest nations to share doses of the Covid vaccination with the world's poorest countries.
Prince Harry made a solo appearance at Global Citizen's VAX Live event in California in May.
The New York concert that the Sussexes will attend on Saturday is part of a 24-hour broadcast from cities around the world.