The Colour of Magic

Terry Pratchett's discworld series. 30+ books of world-building epicness. I read my first discworld book when I was fourteen. Fifteen years later and I still feel like I'm reading a different book every time I pick it up. It's like peeling the layers off a wahoonie, only funner and less fragrant.

Warning-your inner author will suffer a severe bout if self-consciousness with this series. He got knighted for writing this series. No matter how good you are, getting knighted for writing? That's gonna take a while...