Mexican pyramid has two more inside, scientists discover

Kukulkan pyramid built like 'Russian nesting doll' - a second structure had already been found under its exterior and now a third has been revealed

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 on Wednesday.

A 10m tall pyramid was found within another 20m structure, which itself is enveloped by the 30m exterior visible at the Mayan archeological complex known as Chichen Itza in Yucatan state.