Well, we are now in a desert, with a mayan pyramid in the center. The most valuble loot is on top, and the closer to the ground, the lower the value. Have fun, and kill people creatively!
By the way, December 21st 2012 isnt the end of the world. Just Snookie's baby's birth date and Rebecca Black's album's date... Hmm... Maybe it is the end of the world after all...