Up until relatively recently, we could only go so high. After a certain point, it just wasn't feasible to keep building up. In the late 1800s, new technology redefined these limits. Suddenly, it was possible to live and work in colossal towers, hundreds of feet above the ground.

Photo courtesy Wayne Lorentz: Glass, Steel & Stone
The two towers in New York's World Trade Center stood
1,360-feet (415-meters) tall, with a massive steel truss at their
core. See pictures of famous buildings.
In this article, we'll look at the innovations that made these incredible structures possible. We'll examine the main architectural issues involved in keeping skyscrapers up, as well as the design issues involved in making them practical. Finally, we'll peer into the future of skyscrapers to find out how high we might go.
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