Peru: ancient rock engraved with astronomical symbols

Archaeologists think that astronomical observatories were engraved on a flat-surface rock, which were used to track stars and therefore to forecast rain fall for crops and human consumption. This means that probably 4000 year-old Peruvian tribes would already guide their daily lives through the stars.

Read all about it here: http://ancientufo.org/2014/10/peru-ancient-rock-engraved-with-astronomical-symbols/