The Empire State Building: New York's 13-month race to the sky
Crews raised the Empire State's steel 1,048 feet in 23 weeks as Lewis Hine took pictures. The tower later survived a bomber and lost the height record.
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City of London approves twin towers to replace Fountain House
The City of London Corporation approved two new towers on Fenchurch Street, joining a pipeline of new skyscrapers due by 2030.
Two Chinese towers pulled the core out of the middle
A skyscraper's core holds its lifts and mechanical services. Two towers in Beijing and Shenzhen split it or set it apart from the offices.
Chicago's steel frame, and the iron mill that came first
The Home Insurance Building carried its floors on a steel and iron skeleton, not its walls. That idea let Chicago build past five storeys.
Some skyscrapers wear their frame on the outside
A diagrid carries a tower's load on diagonals on its skin. In London it let Newfoundland stand light over an Underground tunnel, and 30 per cent taller.