The final piece of the spire that will sit on top of One World Trade Centre in New York has been hoisted to the top of the building, ready to be fixed into position.
When complete the tower will stand 1,776 feet high, making it the tallest building in the Western Hemisphere. It weighs 800 tons and will be fixed into position, weather permitting, later this month.
Workers at the site paused to watch and take pictures as the spire rose above the city.
The tower is one of four skyscrapers designed to rise around the footprints of the fallen Twin Towers.
The footprints themselves have been turned into a memorial to those killed in the 2001 attacks by al-Qaeda hijackers.
One World Trade Centre, formerly called the Freedom Tower, is estimated to cost more than around £2 billion and is due to open next year.
– JOHN CIANO, CONSTRUCTION WORKER
Ah, it's a proud moment, you know. It's been a long time, you know. I don't know, I'm speechless... for all the people that passed away.
– JOHN DARDIA, CONSTRUCTION WORKER
I'm just full of pride. It's just a momentous occasion and everybody feels the same way, I'm sure. From being here for the recovery until now and seeing what's transpired, it's just a happy day for everybody.