A lot of special beings moving on the roads are tied to specific buildings that can be built. For example the one forge point obelisk placed in a City gives Cleopatra on a palanquin being carried around the city. The House of Wolf gives a Werewolf walking around the city. Etc.
A while ago I noticed some unfamiliar figures running around in my city and got a little suspicious. After a thorough investigation, I found out that it was actually Genghis Khan, Napoleon, and Vincent van Gogh conducting a joint inspection of our latest accomplishments in municipal planning and re-development.