Take a look at the view from the top of the spire being attached to One World Trade Center in New York.
The final section of the 125m steel spire has been put in place.
This makes One World Trade Center the tallest building in the western hemisphere - a whopping 541 metres high.
The building's been put up in place of the World Trade Center buildings, destroyed in a terrorist attack in 2001.
One World Trade Center is among four skyscrapers being built around the site of the fallen twin towers.