yes. i mean, there is the underground which is upside down, but i imagine it 'd be like a video game map, except when you reach the border you show up on earth.maybe it's too small to have a curvature and is shaped like e thick disk.
this makes a lot more sense to me now! I imagine it functions the same way how Hogwarts hides itself. But inside of just looking invisible or ruins to muggle eyes maybe it hides underground like the myths of agartha? Probably not but it’s some good food for thought!