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Anime and Manga
- Bleach has Hueco Mundo, the home of the Hollows.
- In Fairy Tail, the island of Galuna is eventually revealed to be home of the Demon race. However, it's also a case of Dark Is Not Evil.
- The manga Gamaran is set in the Unabara District, which was also nicknamed "The Lair of the Fiends" because of all the insanely powerful martial artists and warriors hanging around the place. Examples include the infamous "Slayer of a Thousand Men" Jinsuke Kurogane.
- Neon Genesis Evangelion: The White Moon beneath Antarctica is where Adam (and presumably the other Angels) originated.
- RahXephon: Tokyo Jupiter where the Mulians and their dollems make themselves at home.
- Genesis of Aquarion: Atlandea, the home of the Shadow Angels and their cherubim and harvest beast creations.
- Devilman: In the television series, the demons originate from the Kingdom of Ice buried far below the surface of the Himalayas.
- Daitarn 3: The meganoids and megaborgs originate from Mars (although they are not aliens).
- Savage Dragon has God City, where various freaks and offspring of the gods go to live.
- Marvel Comics has Monster Island, which is inhabited by monsters and the Kaiju that used to run rampant through the Marvel Universe during the fifties, as well as some of the Mole Man's underlings. It was also the home to the Thing for a while.
- Villa Susto in The Mini Monsters, an Spanish Monster Mash comic book (villa susto means "Scare Village").
- Résurrecion in ''Requiem Vampire Knight is an afterlife dimension populated by monsters who used to be humans in life.
- Midian in Nightbreed is an underground city where the monsters live.
- Monster Island in the older Godzilla movies, starting with Destroy All Monsters. Mothra's origin is always from Infant Island except in Godzilla, Mothra, King Ghidorah: Giant Monsters All-Out Attack!.
- The dimension on the other side of the Rift in Pacific Rim that serves as the birthplace of the Kaiju. Interestingly enough, it's less of a nature preserve and more of a bio-factory where the Kaiju are knit together by their creators.
- Skull Island of the King Kong movies, especially as of the newest film.
- The Nevernever in The Dresden Files is supposed to be this.
- Debatable. Home to the Faeries and some of the weaker demonic types, yes (the really nasty demonic types are "outsiders," and live... entirely elsewhere), but that seems to be about it. However, pretty much any supernatural creature (vampires, ghosts, and wizards of sufficient strength) can enter the Nevernever.
- Starship Troopers: Klendathu, home of the arachnid race.
- Can anyone say "The Nightside" from Tales Of The Nightside by Simon R. Green? Not exactly where the monsters come from, but all monsters eventually end up there.
- The deep valleys of the Hork-Bajir homeworld in Animorphs. The Hork-Bajir actually called them monsters, although they were created by the Arn in reality.
Live Action TV
- In Season 6, this is exactly what Purgatory is described to be. Specifically it's their afterlife and it was constructed by God to isolate his first sentient creations, the Leviathans.
- In Season 13 (!), Sam and Dean get trapped in an Alternate Universe known as "The Bad Place", which is populated entirely by monsters. Not just the regular kind they're used to, Kaiju are included.
- Ultraman Ace: The Chouju of the series originate from Yapool's dimension.
- Buffy the Vampire Slayer and its many otherworldly demon worlds probably qualify.
- The Reaper tunnels from The 100.
- Monstro Town in Super Mario RPG is a town built into a stone cliffside populated entirely by common Mario enemies like Goombas and Koopas. Perhaps an Inverted Trope in that the creatures moved here to be autonomous from Bowser.
- Final Fantasy IV and Final Fantasy VI had the Feymarch and the Land of the Espers respectively, where the Eidolons(IV) and Espers(VI) lived.
- In Final Fantasy VIII, the Moon is the source of monsters. They live on it and sometimes are transported to Earth by a magical event called the Lunar Cry.
- In Final Fantasy XIII, this is what the vast majority of Cocoon's human population believes that Gran Pulse is, though none of them have ever actually been there to know firsthand. When your party eventually gets sent there, you find out that it actually is, but not to the greatly exaggerated extent that the Cocoon government has misled everybody into believing, where the average Cocoon citizen is deathly afraid of anything that is even remotely connected to Gran Pulse.
- In Dragon Quest VIII the monsters are basically everywhere. However, there's a particular village named Trian Gully where monsters reside along with elves and humans, making it something of a subversion.
- Bioshock: This is what Rapture has ultimately become. Sofia Lamb even names it as such.
- The Shin Megami Tensei has three areas that all act as the source of all the supernatural entities in the series, and at the same time, are directly linked with eachother explaning why all demons look the same despite having different sources. The Expansenote , The Sea of Soulsnote and The Great Will.note .
- Monstropolis, the main setting of Monsters, Inc..
- The Powerpuff Girls has Monster Island, where all the Kaiju come from.
- My Life as a Teenage Robot spoofs this trope. Jenny has to fly to Japan, and as she passes overhead, two of the monsters she fought in earlier cartoons wave hello to her.
- The Simpsons: In a Flash Forward Imagine Spot, Lisa is sentenced to Monster Island for having not told people she failed gym in second grade when she was running for President. "Don't worry, it's just a name." Gilligan Cut to Lisa and a few other humans being chased by giant monsters.
Lisa: He said it was just a name!
Man: What he meant is that Monster Island is actually a peninsula.
- The Neitherworld in Beetlejuice, more than the afterlife, is home of all kind of monsters and creepy creatures including monster clowns, werewolves, zombies, vampires, witches, spirits, tap-dancing spiders and skeleton bodybuilders.
- The surrounding area of Gravedale High. Apparently monsters have their own organized sub-culture willingly separated from humans.
- The The Real Ghostbusters... oh boy... The show has lots and lots of different dimensions populated by all sorts of spirits, demons and creatures, among others a literal Ghost Town, the Netherworld and Boo York.
- In Ben 10, we have the Anur System, a monster mash of a planet system inhabited by aliens based on Mummies, werewolves, ghosts, zombies, and Frankenstein's Monster. It is also home to the last living member of a vampire-like species.