The Secret Bunker Beneath the Eiffel Tower
When Gustave Eiffel erected his eponymous tower in Paris, the deal was that it would be the cornerstone of the 1889 Exposition Universelle, and then remain for twenty years. Yet 132 years later, the tower is still there....
https://www.neatorama.com/2021/10/16/The-Secret-Bunker-Beneath-the-Eiffel-Tower/