The Pyramid of Kukalcan was build by the Mayans almost 2000 years ago. It is build in perfect symmetry with the cosmos. The Mayans studied and understood the sky with greater accuracy than their contemporaries in Europe. The building of the Temple is so exact, that at the Spring and Fall Equinox, an illusion appears (cast by light and shadow). Combined with the effigy of a snakes head at the bottom of the great staircases, it gives the appearance of a serpent falling from the sky and slithering down the staircase. There are 91 steps to the top.
Underwater Photography by Bob Goulais.
Watch out below. Bob swinging into the Mayan caverns.