In the ancient Mayan ruins of Chichen Itza sits a pyramid called Kukulcan, also known as El Castillo. Archaeologists have long known that this mysterious structure hides a second pyramid within its walls, but new technology has unearthed something strange: a third pyramid inside the second. El Castillo is a pyramid within a pyramid within a pyramid. If researchers can reach it, it could tell them important things about the early people who built it.

0 notes 2 years ago Jun 03, 2018