Chankillo in Peru features 13 stone towers built in 250 to 200 BC that functioned as a calendar by marking the rising and setting arcs of the sun
The oldest solar observatory in the Americas has been awarded Unesco world heritage status and dubbed “a masterpiece of human creative genius”.
The 2,300-year-old archaeological ruin Chankillo which lies in a desert valley in northern Peru was one of 13 new global sites added to the list of cultural monuments.
