Whether it's courage or stupidity, these adrenaline junkies show no fear. Just watch them test their balance on the roof of a high rise building.
On the Edge: Extreme Stunts on Top of a Skyscraper
11:29 GMT 18.07.2015 (Updated: 11:35 GMT 18.07.2015)
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Fearless or foolish? Either way, it's sweaty palms time!