That would be a great, and very ambitious idea to have the visible landmarks like buildings and stuff, but I also understand the major constraints that comes with a system like that. I was more hoping just for a pin on the surface of major landmarks. Like having a small text label identifying for example; where Olympus Mons lies on Mars. It could even perhaps be a community guided collaborative effort. So for example, if x number of people pin Olympus Mons in their own copies of US2; then it could be uploaded to the admins or trusted members of the community and added in a later update. Or some sort of similar system where all the effort to identify major landmarks aren't on the shoulders of the devs, but a nice addition by committed members of the amateur astronomy, and dedicated US2 users.