It's been said that there are no new stories under the sun. That's not an accurate statement; there's always someone cooking up something new. To be fair, looking at the average Hollywood slate can make you cynical. Yet amongst the reboots and remakes and rip-offs are inspired retellings of a much subtler kind. Everything old can be made new again, and one method is using ancient mythology to inspire modern drama. It's not a leap. Greek myths helped set the tone for today's storytellers, with Joseph Campbell's breakdown of the monomyth — the Hero's Journey — providing those writers with their first One Weird Trick to create a successful story. But it's not just the rhythm of the story — the call to adventure, the return, etc. — that's still used today. It's the myths themselves, dressed up in ways both familiar and not. The former is a fun place to play, with sword-and-sandal style mythological epics like Christopher Nolan's upcoming "The Odyssey" proving there's a lot of life left on Mount Olympus. But there are sneakier ways of retelling the old stories, too, and that's what we're here to learn about: Twelve famous movies you may not have realized were based on tales older than you knew.