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.
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Written by Curiosity Staff June 9, 2017
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