Home of Monsters

There's no place like home, even for those of supernatural origin. And for some, their home is quite different from ours. It could be anything from a dark forest, to hidden caves, or maybe even an entirely different plane of existence. The one thing they have in common is their significance of being the place where these fantastic beings were born and raised.

Places like this usually tend to be a Fantasy Kitchen Sink. The location itself is frequently a Deserted Island, Void Between the Worlds, and/or an Eldritch Location. Not to mention there's always the chance that the place itself is another monster.

Compare Lost World, Monster Town and Fantastic Nature Reserve.

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.
 * 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).

Comic Books

 * 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.

Film

 * Midian in Nightbreed is where the monsters live.
 * Monster Island in the older Godzilla movies. Mothra's origin is always from Infant Island except in Godzilla, Mothra, King Ghidorah: Monsters All Out Attack.

Literature

 * The Never Never in The Dresden Files is supposed to be this.
 * 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 Six of Supernatural, this is exactly what Purgatory is described to be.
 * Ultraman Ace: The Chouju of the series originate from Yapool's dimension.
 * Buffy the Vampire Slayer and its many otherworldly demon worlds probably qualify.

Video Games

 * 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 resepctively, 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 name Trian Gully where monsters resides along with elves and humans, making it something of a subversion.
 * Bioshock: This is what Rapture has ultimately become. Sophia Lamb even names it as such.

Western Animation
"Lisa: He said it was just a name! Man: What he meant is that Monster Island is actually a peninsula."
 * Monstropolis, the main setting of Monsters, Inc.
 * The Powerpuff Girls has Monster Island (by mention only), 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.