This August 2012 photo shows a petroglyph of a two-headed creature in Yerbas Buenas, San Pedro de Atacama in Chile. Thousands of petroglyphs decorate these rocks. (AP Photo/Karen Schwartz)

Associated Press
This August 2012 photo shows a petroglyph of a two-headed creature in Yerbas Buenas, San Pedro de Atacama in Chile. Thousands of petroglyphs decorate these rocks. (AP Photo/Karen Schwartz)
This August 2012 photo shows a petroglyph of a two-headed creature in Yerbas Buenas, San Pedro de Atacama in Chile. Thousands of petroglyphs decorate these rocks. (AP Photo/Karen Schwartz)
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