Professional stuntman Ethan Swanson strapped on a GoPro camera and started jumping from roof to roof in Chicago, Illinois without the use of any ropes or safety net.
Swanson even took a tumble down the side of a roof, landing on to a winding staircase on another building.
A second camera shows a wide angle of the whole stunt, but the video has sparked some debate online as to whether or not it's real or just a well edited marketing stunt for GoPro.