https://newatlas.com/environment/5-200-holes-peruvian-mountain/
#via:hackernews #archaeology #khipu #quipu #peru #+

5,200 holes carved into a Peruvian mountain left by an ancient economy
For nearly a century, a strange band of thousands of holes carved into a Peruvian hillside has defied explanation. Stretching for nearly a mile (1.5 km) along the edge of the Pisco Valley, Monte Sierpe – "serpent mountain" appears to be a deliberate, repetitive and almost mathematical feature – but…




