GOBSMACKED!!!!!!
Clive Ruggles, professor of archaeoastronomy at Leicester University, UK, said: "These towers have been known to exist for a century or so. It seems extraordinary that nobody really recognised them for what they were for so long.
"I was gobsmacked when I saw them for the first time - the array of towers covers the entire solar arc."
The Thirteen Towers of Chankillo run from north to south along the ridge of a low hill within the site; they are relatively well-preserved and each has a pair of inset staircases leading to the summit...
"This implies that you have someone special - the priests perhaps - who watched the Sun rise or set, while in the plaza next door, the crowds were feasting and could see the Sun rise, but not from that special perspective.
Written records suggest the Incas were making solar observations by 1500 AD, and that their religion centred on Sun worship.