Engineering Tower Bridge
From the outside, Tower Bridge appears to be built completely of brick and stone, but once inside, the skeleton of the Victorian beast reveals itself.
Sir William Arrol was the mastermind responsible for the elaborate steelwork that fills every space, held together by millions of rivets; immense cantilevered steel beams extend across the gap between the two Towers forming the iconic Walkways.
The steelwork on Tower Bridge was manufactured and installed with such accuracy and safety that there are no reports of any serious accidents amongst the Steelworkers and no reports of any materials being dropped onto shipping passing below.