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Sears Tower
Willis Tower, formerly named Sears Tower, is a 108-story 1,450 feet (442 m) skyscraper in Chicago, Illinois. At the time of its completion in 1973 it was the tallest building in the world, surpassing the World Trade Center towers in New York. Currently, Willis Tower is the tallest building in the...
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Observation tower
An observation tower is a structure used to view events from a long distance and to create a full 360 degree range of vision. They are usually at least 20 metres (65.6 ft) tall and made from stone, iron, and wood. Many modern towers are also used as...
Telecommunications
Telecommunication is transmission over a distance for the purpose of communication. In earlier times, this may have involved the use of smoke signals, drums, semaphore, flags or heliograph. In modern times, telecommunication typically involves the...
