PW indeed has so many breath-taking, picturesque places that sometimes I just wish I could go in-game to see those places for real lol. Some of my favorites are:
The area around Sanctuary,(who doesn't? It's a classic!)
Corona Sanctuary,
Plume City(its ambience is just so magical!),
Tellus(this city is a masterpiece of the Earthguards)
and the snowy areas east of Tellus. They are just a few
I'll try to provide my own screenshots soon.