10/08/2026
The Eiffel Tower was never supposed to be permanent.
Gustave Eiffel was given a 20-year concession to keep it standing after the 1889 Exposition Universelle, expiring on January 1, 1910. After that, ownership reverted to the City of Paris, and the plan was straightforward: dismantle it and sell the metal for scrap.
Eiffel knew this from the start, so before the tower was even finished, he began looking for a scientific reason to keep it standing. He built a laboratory near the top for meteorological and astronomical work, but the discovery that actually saved the tower came from a newer technology: wireless telegraphy.
On November 5, 1898, engineer Eugène Ducretet used the tower to send the first radio contact in Morse code, reaching the Panthéon four kilometers away. Eiffel kept expanding the experiments from there. By 1907, signals reached a French naval base in Tunisia, 1,500 kilometers out. By 1908, the range had grown to roughly 6,000 kilometers, making it the longest-range wireless station in the world at the time.
That was enough. The French military built a permanent radiotelegraphy station beneath the Champ de Mars in 1909, and the tower became too strategically valuable to lose. On January 1, 1910, instead of demolition, the City of Paris extended Eiffel's concession, not for another 20 years, but for 70.
The tower's wireless station later played a real role in World War I, intercepting a German communication in 1914 that helped French command respond at the Battle of the Marne, the battle that stopped the German advance on Paris.