If you are unfamiliar with Mayan ruins, they are usually excavated from a jungle. Trees and other plant life have overgrown them over the centuries after their abandonment, and dirt then fills them in. We have actually climbed to the second or possibly third level here (this was taken almost 4 years ago, and my memory has dimmed). I am not so sure that the grassy area surrounding this temple wasn't filled with limestone rock when this temple was completed, as we are already partially up the temple.