A fearless teenager has snapped these vertigo-inducing pictures while dangling 700ft in the air from some of London’s tallest skyscrapers. Harry Gallagher, 17, from Essex was able to dodge security to scale the likes of the ‘Walkie Talkie’, the ‘Cheesegrater’ and the unfinished London Pinnacle. The adrenaline junkie and his friends, who do not use safety equipment or harnesses, treat the scaffolds surrounding multimillion pound towers as their own urban climbing frames. Scroll down for video Harry Gallagher and his friends (pictured his friend Johnny on a crane over Canary Wharf) have scaled dozens of London's tallest skyscrapers to capture photographs
@highlight
Harry Gallagher, 17, has scaled iconic London buildings such as 'Walkie Talkie', 'Cheesegrater' and Pinnacle
@highlight
Avoiding security and without safety equipment he has climbed cranes to capture series of amazing photos
@highlight
Teenager and his friends are part of a growing community of cityscape adventurers known as Urban Explorers
@highlight
They choose to climb huge cranes next to new buildings in construction or disused rail lines and reservoirs
@highlight
Six months ago he was arrested as he attempted to scale frame of new apartments in Vauxhall, south London
@highlight
He says his toughest challenge is to convince his mother to see photos who 'doesn't want to hear about it'
One of harry's friends lies inside the cab of a crane as it overlooks @placeholder.