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World's Tallest Structures
It is not easy to clearly define the World's Tallest Structure. There are more than 30 different classifications, based on the material of the structure, uses of the structures, structures with or without antennas, structures built in water, etc. This is a quiz on general facts about some of these structures and their classification.
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Notable Skyscrapers
It was not until the late 19th century that the word "skyscraper" was first used to describe the amazing high buildings constructed in New York. A building had to be at least 150m high to be called a skyscraper. Today, 150m is just the beginning.
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World's Tallest Towers
Faced with the necessity to support their own height, these structures pose a multitude of challenges to the most ambitious of architects.
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