Guy's Hospital is the tallest in the world despite being almost 40 years old. It consists of two towers that are interlinked together - the User Tower that hosts the hospital accommodation which rises to 122 metres, and the Communications Tower, a 138 metre tall service section that's boosted to 142.6 metres by the boiler flues.
The building is built on a 3.05 metre thick raft that allows it to "float" above the soft London clay in a more efficient manner than traditional foundation piles.
The "head" of Guy's Hospital contains a 150 capacity lecture hall with overhanging balcony that has a sheer 120 metre drop to the street below.
The Eighties saw plans for neon lights to be fitted to the distinctive if brutal tower shape to highlight it at night but these were refused by Southwark Council.