Sorry I'm late posting, but I had to have my finger operated on yesterday and I was too tired when I returned home. I went to a hospital that specializes in hand surgery and this allowed me to discover the Eiffel Aerodynamics labs in the street nearby (rue de Musset). I did not know that Eiffel pioneered the study of the effects of aerodynamics on objects and that he first used his tower for that (dropping objects from it!). Later he built a wind turbine, which is in this building and is still in operation. Amazing, isn't it? (Much) more in this publication - in English.