Wizard City: ? Krokotopia: Egypt Marleybone: England Mooshu: Japan Dragonspyre: ? Celestia: ? Zafaria: Africa Avalon: Middle Ages, Knight Era Azteca: Aztec empire Khrysalis: ? Polaris: France? Russia? Mirage: Arabic? Empyrea: No idea?
I would add:
Wizard City: Generic Fantasy Village / Hogwarts Krokotopia: Egypt under the excavations British explorers Marleybone: Victorian England Mooshu: Feudal Japan Dragonspyre: Russia under the Czars Celestia: Steam Punk / Atlantis (I think it's either part of the Marleybone or Skull Island skyway)
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