Final answer:
The structure known as El Castillo in Chichen Itza was most likely used for religious and astronomical purposes, serving as a temple for the god Kukulkan.
Step-by-step explanation:
The Early Mesoamerican Structure in Chichen Itza
The structure shown in the photo is El Castillo, a step-pyramid built by the Mayans in Chichen Itza. El Castillo, also known as the Temple of Kukulkan, was most likely used for religious and astronomical purposes. It served as a temple for the god Kukulkan and during the spring and fall equinoxes, the setting sun would create a serpent-like shadow on the pyramid's stairways, connecting to the Mayan belief in the plumed serpent deity.
References:
Mayan Architecture: Chichen Itza by LibreTexts™
Mayan art by wiredtourist.com