Equinoccio de la Primavera draws thousands of people from around the world to witness the shadow that seems to crawl down the El Castillo pyramid in the Chichén Itzá temple complex. The shadow represents the snake god, Kukulcan, and takes the form of a giant, slithering snake that slowly descends the stairs of the largest Mayan pyramid in the country. Sunlit triangles appear to work their way down the stairs, finally illuminating the snakehead at the bottom and forming the giant sunlit serpent.

Venue: El Castillo, Chichen Itza

Date: 20 March 2013