I think Atlantis had also inspiration from Miyazakis Castle in the Sky:
Both places having a similar skyline and a big, blue power crystal (Heart of Atlantis and Power of Laputa)
Both housing magitek robots, which defend the cities during an assault (the Stone Guardians and Laputas robots)
Both locations having a writing system unknown to the surface people (Atlantean and the Laputa glyphs)
In both cases, only Royals are able to channel the Heart Crystals power
Both are tied to a biblical event (Atlantis to the Great Flood; Laputa to Sodom and Gomorrah)











