About: When the term, skyscraper, was originally used in the 1880s it described a building of 10 to 20 floors but now describes one of at least 40–50 floors. One common feature of skyscrapers is having a steel framework that supports curtain walls. Modern skyscrapers' walls are not load-bearing, and most skyscrapers are characterized by large surface areas of windows made possible by steel frames and curtain walls. Skyscrapers are usually situated in city centers where the price of land is high. Constructing a skyscraper becomes justified if the price of land is so high that it makes economic sense to build upwards as to minimize the cost of the land per the total floor area of a building. Puzzle Of The Day On:
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