And see those teeeeeny little people under the trees? Feeling high?
The Maya began primary development at Chichen Itza around 600AD (although there is evidence of some building as early as 300AD), and left for unkonwn reasons in the 9th century. Chichen Itza was resettled in the late 10th century, then invaded by the Toltecs, then came the Itzas and then abandonded again, mysteriosly, in the 14th century.
The story of the site then is very complicated, layered as it is by all the different eras of occupancy and by overlaying constructions.