By consulting the map, I was able to learn a bit about the visual language Flagship is using in its map interface, as well how some of the instanced zones will be laid out. To some degree, all the zones will be randomized; it's their level of randomness that varies. If a point on the map is marked by a solid square with rounded edges, it means you will always encounter certain key landmarks when you visit it (the British Museum is a good example). If the name of the area is surrounding by a dotted circular line, however, then all bets are off. This connotes that an area is completely random when you enter. Sometimes, you'll travel through subway tunnels; other times you may be completely above ground. This is supposed to reflect the fact that, when under attack by the legions of hell, the world tends to be unstable, and parties interested in traveling safely will tend to take the less demon-infested path.