Tourists take pictures of themselves in front of the Mayan temple of Kukulkan, the feathered serpent and Mayan snake deity, at the archaeological site of Chichen Itza, in the southern Mexican state of Yucatan October 29, 2012. Chichen Itza, which means "at the mouth of the well of the Itza", was a religious and commercial center during 900-1200 A.D. in the northern Mayan lowlands.The temple of Kukulkan was used for religious ceremonies and astronomical studies. Picture taken October 29, 2012. REUTERS/Claudia Daut (MEXICO - Tags: SOCIETY TRAVEL)