I found sets at Dollar General in 2016 called Structures by Block Tech.
The boxes looked like this
I found multiples and found the pieces were good with a lot of tiles that I wanted to use for a subway or train car
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The boxes looked like this
I love the Eiffel Tower and seeing is made out of Lego
I think the trick of building the tower is getting the base legs straight with inner connecting arches and proportional to the top length of the straight vertical portion
The large lego tower did this great as a set
I think that the straight beams going up from the 4 corners in contrast. To the connecting round arches between the 4 towers are hard to do with square blocks!
Here's more great pics of mocs people have done...
I cannot find who did this on the internet but I think it is genius using smaller more detailed pieces in ways that I would never have thought of.