I've been to Mount Bonnell—does that count, are you thinking further west? The view from Mount Bonnell is definitely beautiful, especially at sunset:

https://www.instagram.com/p/CZYPh_5Mkuz

And don't get me wrong, I also think the views just from Congress Ave bridge are gorgeous. But to me, (and this is completely subjective) I found I was much more captivated by Chicago's views of Lake Michigan, its skyline, and its architecture. I think part of it is that I love beaches, and Chicago has some really great beaches.