The story of The Shard - the colossal glass skyscraper that has transformed London's skyline.

The demanding construction schedule required builders to add a new floor every seven days, and has used 100,000 tonnes of concrete, 11,468 glass panels, a spire made of 500 tonnes of steel and the UK's tallest crane.

Its construction is the dream of property developer Irvine Sellar, a former fashion-store owner, who appointed world-renowned architect Renzo Piano, who's famous for landmark buildings including Paris's Pompidou Centre and the home of the New York Times.

Filmed over four years, The Tallest Tower: Building the Shard provides exclusive behind-the-scenes access to this architectural journey, and the story of one man's desire to leave a lasting mark on the capital.