Jonathan's journey takes him to the Lloyd's Building in the heart of the City of London. Built between 1978 and 1986, it is one of the finest examples of high-tech architecture in Britain and one of the great icons of London.

Aided by top climber Lucy Creamer, Jonathan abseils over 300 feet to reveal how this ultra-modern building was inspired by a Gothic castle. He scales the iconic stainless steel exterior to reveal why it is known as the Inside-Out Building, and zip lines across a sheer drop to investigate the building's humble origins as a coffee shop. He also meets Lord Rogers, one of the greatest architects of his generation and the man behind the audacious building.