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Pretty sure thats an air traffic control tower, i.e. a watchtower with people in it. The “saucer” shape is so they can see in every direction
I assure you it’s not though. This is in the middle of the city.
Edit: it’s this tower, the article has a daylight picture. https://fr.wikipedia.org/wiki/Tour_Reyers.
Do you know of an example of one like that? With a link?
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