Archaeologists are searching for the secrets of why the ancient Mayans chose the sites for the famed pyramids of Chichen Itza by looking underground.

New assessment of recently found Mayan pyramid puts it up among the biggest FIVE years after its discovery, excavations of a Mayan pyramid in Mexico have revealed it to be among the largest yet found.

Scientists have found a second Mayan pyramid inside El Castillo, or the Castle, at Chichen Itza in Mexico.

The pyramid boasts 365 steps to represent each day in the Haab, a Mayan cyclical calendar that was approximately based on the solar year.