I built a medieval fantasy world to accommodate people who wanted to play any fantasy character type, be it something that exists already (dwarves, elves, humans, orcs) or something of their own creation. The world was commonly called Ebonfort, and housed dozens of RPs on this site at the time.  

As for basic details on the world, I can provide a link for all the details. I've built a wiki for many of the more advanced information. 

http://ebonfort.wikia.com/wiki/Ebonfort_Wikia

As well as the original master thread that has lots of details as well.

http://www.roleplayerguild.com/topics/83037-ebonfort

I can give more detailed information, but questions help, because there's lots of information.