Project Omen (I haven't actually came up with a name yet) incorporates both the "real" world (which is basically just a fictionalised version of our own world) and an "Otherworld." 

Characters who are magic users can move between the two using "gateways" that open in liminal spaces and times. As the story is about a magical school its likely to be mostly set in the Otherworld, which will be heavily inspired by actuall mythology and folklore. The story will explore the differences and similarities between the two worlds and how the main character struggles to adapt.