There are thousands of aligned holes in Peru. Archaeologists now think they know who created them

By Ashley Strickland, CNN (CNN) — A series of about 5,200 holes stretching nearly a mile (1.5 kilometers) across the Pisco Valley in the southern Peruvian Andes has baffled researchers for nearly a century. But a fresh look at the site, called Monte Sierpe, or “serpent mountain,” may help archaeologists to decipher why ancient people