These realms aren't native to my world. [not so casual emphasis there] And this place certainly doesn't match our records [read: fairytales] of the spirit realm.

Thus far, three others are open. The first is a place called Twilight Town. The second is a space vessel, called the Mother of Invention. The latest is a place called Ponyville, from a land known as Equestria. That one's rather special.