December 21, 2012 marks the close of the 13th b'ak'tun in the Mayan calendar. That's spawned a number of doomsday theorists to predict our world's going to end. Some think it will be by galactic alignment. Others believe we'll be struck by Planet Nibiru (aka Planet X). We hope we're around to celebrate New Year 2013. But in case we make a quick exit, 500px presents a series of disturbing yet evocative photos from our community. Are you brave enough to look?