I have a really young world I made for my 2 year long campaign that just ended a month ago. It just experienced it's first world war.

The world is made up of horizontally ever growing "planes" which are loosely defined as concentrated energy. That energy interacts with other things to creat matter that builds the world. (Ex the water plane interacting with the ground plane makes a lake). The campaign is set in the center where all the planes interact with each other and create a world similar to ours/general fantasy setting.

The fun part about the map is that because everything is growing outwards and centered on where all the planes meet, it's in polar coordinates instead of Cartesian.

I have a small world building blog on Tumblr (tales of Cerano) if you like little world tidbits.

Click image for larger version. 

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