Large platform on which four smaller ones rise. It is located to the south of the Great Plaza. Initially it was considered the largest and most important of the site, hence it was assigned the number 1.

Platform 1A is round. On the other hand, Platform 1C houses well-preserved anthropomorphic masks that possibly date from the Early Classic (300-600). They show human faces in which the chin, mouth, nose, eyes and a plume are clearly distinguishable.

Platform 1A: Round temple that was possibly dedicated to Kukulcan. It has an entrance, which is oriented to the east.