click on the pictures to enlargeChac-Mool (foreground) and Kukulcan (the snake heads at the top of the stairs on the platform in the background).
Depictions of Kukulcan are everywhere.
This is what everyone thinks of when they hear Chichen Itza, the step pyramid dedicated to Kukulcan. On the left (west) side you can see that it has been somewhat restored; on the right (south) side it has not been. Even if every rock were in place the restoration would not be complete; the Maya painted their pyramids. This one was red.
If only I'd had more time....