orologio en Altadefinizione. Massive earthquakes. Giant tidal waves. Super volcanoes exploding. Raging firestorms. These are just a few visions of a global apocalypse that some say will happen on December 21, 2012. That's when the eerily accurate Mayan calendar will come to a sudden end. That ancient calendar is causing a modern day panic. People around the world fear that our planet faces a catastrophe never seen before in human history.