The world’s smallest book is “Teeny Ted From Turnip Town”, and measures 0.1mm by 0.07mm.
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The Eiffel Tower should have been dismantled after the Universal Exposition of 1889 for which it had been built ; the Eiffel Tower has especially been saved by telegraphy.
Indeed, the Eiffel Tower was used as an antenna during World War One and as an experimental laboratory for electromagnetic waves.
Sources:
Universal Exposition on Wikipedia
Eiffel Tower on Wikipedia