By the modern age, you'd think everyone would want to have their borders marked, and city locations are kinda hard to hide. I don't want to have to give up 10-30 gold every time I want to know who owns a city and where it's at. Maybe you could have it so improvements are not shown (so you can't plan to attack the strategic resources right away), and it stops updating with people you are at war with, so if you are hiding a city, they can't find it as easily.
Thoughts?
Thoughts?