Early Horizon • Earth.com

That time — roughly 400 B.C. — is known as the Early Horizon period. And there are multiple areas around Chankillo that prove people did build impressive fortifications back then. It goes to show just how rife with conflict this part of Peru was. But something about Chankillo just didn’t add up… Photo Credit: Werner Forman/Universal Images Group/Getty Images

News coming your way
The biggest news about our planet delivered to you each day