I'm a huge nerd when it comes to Atlantis. I'll spend hours researching possible locations, how it might have disappeared into the sea, and what sort of technology they have. I even have a half-written novel (scrapped when I realized that it was terrible) about Atlantis still being in existence in modern times. Don't even get me started on Atlantis: The Lost Empire, an animated feature film by Disney starring Michael J. Fox. It's one of my favorites.
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