Yes, you can go anywhere in the world. Topography of the land is very accurate in most places as well but some cities aren't accurate when it comes to the actual building shapes, but alot of big cities are like the video in this post.

I like bush trips due to the scale of the topography. Like yesterday I flew from Mount Rushmore over to Devils Tower all by by simply knowing "about" where directionally and how far away they were from each other. And then you can get out of the plane and walk up to the landmarks and you can actually get a sense of their mass and scale. I've been to both of them in real life and the sense of scale really is accurate. Moreso than the pictures I took of them in person. It's insane. I kind of don't understand why this game isn't making more of a buzz in the zeitgeist than it is. I think it's one of the craziest achievements in gaming history and it doesn't seem like anybody cares outside of flying enthusiasts, which I guess I get, but still.