Article: Eiffel Tower tech

Arguably the most widely recognised structure in the world, the Eiffel Tower was designed to stand for only 20 years -- and some predicted it would collapse long before then.

Even as it was being built for the 1889 Universal Exhibition, a professor of mathematics sagely calculated that when the tower was two-thirds complete, its legs would buckle and the whole thing would come tumbling down, crushing workers and houses alike.
 
Saw a documentary on it a while back and one of the main reasons it was not pulled down was because it was being used as a radio tower which offered long range, the guys tested the range in old airplanes using "portable" radios. Was used for communications during the war after that.

Remarkable thing is back in those days only one person died during construction which is very good considering how open the structure is.
 
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