My Architecture sets of skylines of cities I visited west of me. In order of sequence it should be San Francisco, Las Vegas, New York City and London. In order of number of times it is Las Vegas, San Francisco, New York City and London. The last two only once each. I’ve visited the USA eleven times in total. Only one time (partially) for business (Las Vegas when Comdex was still a thing). I used to love to visit that country. A nice mix of nature and cities.  
I even visited Washington DC for two weeks for its musea and landmarks only. I did the same in London for one week. Still haven’t visited every museum I wanted.

I don’t think there are more USA skyline sets in the Architecture category. I know of Chicago but the only thing I did there was land and depart. In between I visited the GP F1 race of Indianapolis of 2001. Flying was quite surreal at that time. Nearly empty planes and flying into Chicago we still had metal cutterly. On the way back everything was replaced by plastic stuff.

A lot of unnumbered bags again. Mostly plastic but the London set had unnumbered paper bags. And it was the only Architecture set where a piece was missing (6051511, but I had an extra 302301). That’s the reason that grey pointy thing under the Tower Bridge is dead in the water. I hope LEGO will send it quickly.

At the moment I am determining if I want to buy some MOCs of skyline off of Rebrickable. There are really interesting ones available. Washington DC and Rome for example.

My Architecture sets of skylines of cities I visited west of my place of residence