Sources:
https://en.parisinfo.com/what-to-do-in-paris/info/guides/explore-the-eiffeltower
https://www.toureiffel.paris/en/news/history-and-culture/15-essential-things-know-about-eiffel-tower
https://www.toureiffel.paris/en/news/130-years/eiffel-tower-daughter-tall-metal-viaducts
https://www.pariscityvision.com/en/paris/landmarks/eiffel-tower/all-about-eiffel-tower
https://www.toureiffel.paris/en/the-monument/key-figures