Experts have discovered a third structure within the Kukulkan pyramid in eastern Mexico, revealing that it was built like a “Russian nesting doll,” experts said Wednesday. A 10-meter (33-foot) tall pyramid was found within another 20-meter structure, which itself is enveloped by the 30-meter pyramid visible at the Mayan archeological complex known as Chichen Itza in Yucatan state.
The smallest pyramid was built between the years 550 and 800, engineers and anthropologists said.