5. CNA Heart
This 1972 constructing took the mould of a high-rise, 44 storey, constructing in America’s famed metropolis of Chicago. The constructing was devised by Graham Anderson, Probst & White and adorned a energetic purple. Nevertheless, in 1999 a considerable piece of window fell from the 29th ground, taking the lifetime of a passerby.
An investigation quickly discovered that thermal growth was responsible.
