Inside that little door is a claustrophobic's worst nightmare, a passageway of steps, so narrow that two large people could never fit side by side!

The outer Postclassic pyramid, loaded with non-Maya architectural details, was built over a Terminal Classic Puuc-style pyramid. The design is thought to relate to the Mayan calendar. Each of the four stairways has 91 steps, and the total number of steps, combined with the number of stairways and the single upper platform adds up to 365, one calendar year. The nine main platforms of the pyramid are thought to represent the 18 months of the haab, and the 52 panels represent the number of years it takes for a calendar round date to recur.