I've been playing around with a Mythic Earth setting for a story I'm writing that's based entirely off Greco-Roman mythology, but includes a host of other cultures outside of Europe. Basically the Earth (called Terra) is a flat disk with the sun and moon orbiting it, and it sits between Olympus, an asteroid-like landmass the size of North America that is home to the Olympians, and the Underworld, the realm of the dead that exists on the underside of Terra's disk but is inaccessible to most humans.
The gods of Greek mythology are real and the myths made about them are basically abridged or altered versions of their true stories. Like how Gaia never had the hecatonchires and cyclopes as children, and Ouranos's blood gave rise to humanity, animals and monsters. Monsters in this world have the ability to assimilate the traits of the living organisms they consume and thus evolve, and as they spread out across the world, they became the mythical races we know and love today, from the Americas to the Far East.
I wanted to portray the gods in different ways depending on how cultures outside of Europe perceived them. Like the Olympians being worshipped under different names, powerful demigods being worshipped as gods for their awesome power like in Hyperborea and Japan, or monsters being seen as deities for their magical powers, like in South America and Egypt. I wanted to play around with having Greek Mythology as a core setting but it branches out into other mythologies and stories.