According to the Mayan calendar, Dec. 21, 2012 marks the end of the Mayan cycle known as Bak'tun 13 and the start of a new Mayan age. In this Dec. 21 photo, Mayan shamans celebrate the milestone in a ceremony at the Tikal archaeological site, nearly 350 miles north of Guatemala City. For more on all the doomsday talk this week, see our list of the worst predictions for 2012.
JOHAN ORDONEZ/AFP/Getty Images





