I remember a few years ago they thought they had a temple on a hill and they discovered the entire hill was the temple. It was so overgrown they couldn’t find the base. If the environment fights back that hard...

I mean, you’re fighting entropy every day. Sounds like an eco paradise but is also hell for historians.

In this case the Mayan society had already gotten to a point where they were able to build monuments that have lasted thousands of years. I am not that surprised that had incredibly sophisticated agriculture on a large scale because how else would they support a large population in the cities?