16. They Built MASSIVE Pyramids Without Metal Tools
Everyone knows about the Egyptian Pyramids, but did you know that The Mayans built these massive structures too? The Pyramids built by the Mayans often had flat tops and had steps that acted as stairs to be climbed over. And they built them all without any metal or automatic tools!
They used these structures as temples, where several important religious rituals occurred. They also used it to bury their kings and royal members. The biggest Mayan Pyramid, the 78-feet high Kukulkan, can still be seen at Chichin Itza, Mexico.