I don't really get this premise that people would recognize the city they're in. It's pretty much a hl2 staple that the citizens have no fucking idea what they're even doing. You literally get your reasoning for this in the first level of hl2... it's a combination of constantly moving humans around in the few remaining (combine protected cities), drugging their water supply and over 20 years of suppression of culture, identity and anything remotely old world. Half life alyx goes further with this by showing a globe marked up from where the CCA has shifted people about. The best a bunch of Harvard and MIT graduates can do is say they're somewhere in Eastern Europe in hl2, as shown with alyx putting eastern Europe in a big circle.
The only citizens who show any semblance of awareness is the 'don't drink the water, they put something in it to make you forget. I don't even remember how I got here" guy and the "the trains are always arriving but they never have anyone on, but they're always leaving but no one ever gets on..." guy, both of whom would likely be seen as nutters. They clearly stopped taking their drug laced beverages, but it's still left them with no idea where they are because they've been subject to years and years of constant relocation.
There's actually historical precedence for this as well, the Chinese and Soviet governments under their more Stalinist Communist regimes were well known for constantly moving people around to keep them from being too 'comfortable' as to incite political concern. It's completely plausible.
Furthermore I think we see a pretty pacified outside in hl2, but America was the very heart of the Xenian catastrophe. Without a doubt, America would be absolutely unrecognizable. Cities wouldn't just be unrecognizable, nobody would care lol. It'd be like people giving a shit about a pile of rubble. I mean the best we could say is... identifying nearby water, but...why? Why would that matter when the old world is literally fucked?