Archaeologists amazed by Peru's 'mind-blowing' ancient solar calendar built into desert. Thirteen striking stone towers. Two observation platforms. One temple with a mysterious purpose. And defensive walls to ward off unwanted guests… We’re talking about the archaeological site at Chankillo in Peru, which baffled experts for more than a hundred years. Their first thought was that the awe-inspiring complex was a place for cult rituals. When researchers finally uncovered the truth, though, they realized they couldn’t have been more wrong.