The Oracle at Delphi

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In ancient Greece, in the town of Delphi on the slopes of Mount Parnassus, there was a temple devoted to the god Apollo. Within a sacred chamber, a priestess called the Pythia would breathe in sweet-smelling vapors emanating from a crack in the rock. These vapors would send her into a state of frenzy during which she would channel Apollo and speak gibberish. A priest would then turn that gibberish into prophesies.
Science: The temple was a real place, and scientists have discovered two geologic faults running beneath the site, now in ruins. Gas was likely emanating from those fissures when the oracle was in action. But researchers have been arguing over the contents of the euphoria-causing gaseous mix. Theories include ethylene, benzene or a mix of carbon dioxide and methane.

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