The real story
The tower was built for the 1889 World's Fair, marking 100 years since the French Revolution. Two years earlier, a group of famous artists and writers, including Guy de Maupassant and Charles Gounod, published a protest in a Paris newspaper calling it useless and monstrous. Gustave Eiffel's company was given the right to run it for 20 years, and after that it could be taken down.
Eiffel knew he had to make it useful, so he backed scientific experiments from the top. In 1898 a radio link was made from the tower to the Panthéon, and from 1903 the army used it for long-range radiotelegraphy. In 1910 its concession was renewed, and during the First World War its radio station listened in on enemy messages. Today it still carries broadcast antennas.