The Eiffel Tower has been the definitive symbol of Paris in France for as long as anyone reading this has been alive. If you went back to the time of your great-great-grandparents, though, they'd probably remember the excitement about it being built.
The French monument opened to the public in April 1889 after years of construction work. Here's a rare picture of it in its half-built state from early 1888, after the first floor had been completed. It still had a long way to go!