I've designed lots of different game worlds because I love drawing maps (hence the reason I joined the forum), but I always keep coming back to Quindia. Some of the places have names that a goofy ten year old would come up with (the city of Frodo), but I can't bear to change them now.
Some of the iconic additions came during the years when I dropped a ready made adventure into a game and they stayed part of the campaign world. Others names, like Haven, have been used in many different worlds. A few others are purposely generic (the Black Forest) to invoke a nostalgic sense of mystery such a place would have held when I first started playing D&D.
The overall effect is that the world has a familiar feel even for people who see it for the first time. The games I've run over the years have shaped the world (the fifth ring was once whole, Ram's Wall was built by a player, Gornath was once the capitol of an empire).
I'll post some of my other maps here soon, but none have the history of the Realm of Quindia.