[mousquet]

That would be a great move by UNESCO IMHO. Those structures in Chicago are old enough to be recognized as something historic and prestigious, now.

In particular, it could change the views of certain annoying nimbys that claim skyscrapers are only dystopian achievements by dominant freaks who want to crush everybody around them, blah blah blah...
Maybe they are dominant freaks, themselves.

Fact is skyscrapers appear to be quite convenient in enhancing both density and urban comfort, at least in modern urban environments and when properly laid out.