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skyscraper history - key
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SKYSCRAPER HISTORY - KEY

The Burj Dubai  OWES its success to seven key inventions.

At the heart of each of those seven buildings lies a major technological innovation that ALLOWED ENGINEERS to reach taller into the sky.

Seven ingenious leaps forward that HAVE ENABLED skyscrapers to evolve from big to bigger into the world's biggest.

Stairs in old office buildings were long and very dark, so people weren't willing to CLIMB STAIRS more than to the second or third floor.

In the explanation of the security device for elevators, the rope breaking TRIGGERS a chain of events that locks the elevator.

The elevator completely transforms the URBAN LANDSCAPE .

The Burj Dubai takes the idea of the elevator to THE EXTREME . Its more than 160 storeys STRETCHES elevator technology to its absolute limit.