Hidden tunnels beneath Mexican pyramid are ‘PASSAGES TO THE UNDERWORLD’ A PYRAMID in Mexico contains hidden passages to the underworld which have been revealed in unprecedented detail. Share: Facebook Twitter Google+ Stumble Digg Email ThisBlogThis!Share to XShare to Facebook Related Posts:Global Health: Tiny Nanoparticles to Treat a Huge Problem: SnakebitesE.P.A. to Disband a Key Scientific Review Panel on Air PollutionReaders Tell Scientists Who Say Dogs Aren’t Geniuses: ‘My Dog Is Exceptional’Critic’s Pick: ‘Hilma Who?’ No MoreThe New Old Age: Every Older Patient Has a Story. Medical Students Need to Hear It.Q&A: How the Humble Bean Went Global