A daredevil has "rooftopped" London's Shard building and filmed himself in death-defying positions 300 metres from the ground.
The YouTube user known as Cass Online posted footage of him stepping over thin metal beams at the very top of the Europe's tallest building.
Rooftoppers is the name given to adrenaline-junkies who get to the very top of incredibly tall structures to take jaw-dropping photos.
In the seven-minute clip, Cass can be seen filming his journey to the central London skyscraper.
The YouTuber daredevil filmed himself at the top of The Shard
He is seen walking along narrow beams
He can then be seen walking up to the observatory platform near the top of the building that offers visitors panoramic views of the capital.
As members of the public mill around him looking at the views, he waits for his perfect opportunity to get out onto the roof.
In the video, Cass says: "So, we've been here for a while.
"It's 20 minutes before it closes, I've found my point of entry, got my GoPro in the bag, I'm ready to do this – let's go."
The Shard in London is Europe's tallest building
It then cuts to him climbing up a restricted staircase that leads to the apex of The Shard.
Cass then performs his terrifying stunt, which sees him lean write over the edge of the building, despite it being a drop of hundreds of metres.
He also walks along thin connected beams that are barely the width of his foot in what makes for uncomfortable viewing.
Since the video was posted online yesterday, it has amassed thousands of views.
And most people appear to be in awe at his incredibly reckless stunt.
One person wrote: "This is the best rooftopping video of 2017. You are legend."
Another commented: "Wow never thought the shard was possible to climb."