This type of building construction combines tall load-bearing frames with elevators to make many floors practical.

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Your new ahaSkyscraper Construction

Skyscrapers became possible by combining steel frames with elevators, transforming skylines from the late 1800s. Source: Skyscraper ↗

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13These systems control intersection flow, with the first electric signal appearing in the early 1900s.RECALL
Traffic Lights
Traffic lights control intersection flow, with the first electric signal appearing in the early 1900s.
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14These systems move people between levels automatically and were first introduced commercially around 1900.RECALL
Escalators
Escalators move people between levels automatically and were first introduced commercially around 1900.
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15This engineering system regulate temperature, humidity, and air quality across modern buildings.RECALL
HVAC Systems
HVAC systems regulate temperature, humidity, and air quality across modern buildings.
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