wizard city = im not sure its based off of anything krokotopia = egypt grizzlehiem/wintertusk = Scandinavia (i might be thinking of someplace else) marleybone = london mooshu = japan/china dragonspyre = rome (i think, not sure) celestia = not quite sure this is based off of a real place, but it might be atlantis zafaria = africa avalon = midevil europe azteca = tenochtitlan (present day mexico city) krysalis = idk, never been there polaris = idk, never been. But from some pictures i've seen, it reminds me of france. To contribute to that, theres a housing item called "patriote graffiti". If you place it, it says "viva la penguonia". I know that "viva la..." means "long live the..." in french. To add onto that, a bit of past experience from my days in Pirate101. In Pirate101, at some point you help break Napoleguin out of prison. Name sounds familar? A look in a textbook or a quick search online will mention Napoleon, a former emporer of france. With all that, it's probably safe to say polaris is based off of france. Anyways, Mirage = still not quite sure, i've never been there.
Zafaria is an African safari. It also has a reference to "The African Queen." Watch the Humphrey Bogart and Katharine Hepburn movie by that title. Then look again at the man and woman waiting by the boat.
Mooshu is feudal Japan I think.
Marleybone is Victorian London. It has references to Sherlock Holmes.
Wysteria seems to give a nod to Harry Potter. (Wizard school.)
Dragonspyre -- there are so many dragons in literature I don't know for sure.
Mirage seems to give a nod to the Star Wars films.
Polaris is based off of Russia. Walruskburg=St. Petersburg. Rasputin was actually a real historical person who advised the royal family of Russia before the Bolshevik Revolution.
Mirage is fairytale Persia with many 80's sci-fi movies references.
I asked a question similar to this too, I will try to answer this question to the best of my ability even though I am still in khrysalis part 2
Wizard city: Hogwarts/generic mmorpg starting world
Krok: Wow nobody can figure out this one (sarcasm lol)
GH: Sweden or Denmark in the middle ages
Marleybone: England in I think the 30's
Mooshu: east Asia in the 1400's or 1500's
Dragonspyre: an underworld version of the Roman Empire
Celestia: Atlanta/Polynesia
Zafaria: Gee another hard one (sarcasm)
Avalon: Feudal England/Ireland/Scotland/
Azteca: The aztecs during the age of discovery/dinosaur extinction
Khrysalis: This one actually is hard (not sarcasm), but I'm going to guess a combination of WW1/ fuedal France/ and Israel in the early 1900's When Zionism grew
Polaris: I heard it was like the Russian Empire before the Soviet Union
Wizard City: Pretty much its own thing. One could argue Hogwarts maybe
Krokotopia: Ancient Egypt
Marleybone: Victorian England
Mooshu: Feudal Japan/China
Dragonspyre: Been trying to figure this one out for a while; you got a desolate world that resembles Rome with ghosts that have Russian accents and remains of dragons
Celestia: Atlantis
Zafaria: African Safari
Avalon: The Middle Ages
Azteca: Most likely the Aztec Empire
Khrysalis: Idk to be honest; it's a little hard to tell
Polaris: I say it's inspired by the French Revolution and the Russian Empire prior to its dissolvement