Pick your favorite fantasy world... This isn't regarding books or movies. It can be based on the amount of lore available, history of events, battles faught, the inhabitants, magic, and geography/landscape that pertains to these planets.
I know there are so many other fantasy worlds out there but the ones that I know of that seem to be very popular are the 6 I mention. If I'm wrong, then flame away. I thought this would be a fun "off" topic to discuss.
For me, It was a close call between Tolkien's "Arda" and George Martin's world. Right now, I'm still stuck on George R R Martin's fantasy world "A Song of Ice and Fire".