One of Many Mayan Sacred Sites

We only made it one of the Mayan Sacred sites but it won't be our last visit.  Here is a view of the lake from there. It was a bit risky trekking up the steep cliff but here I am sitting beside a couple of ancient stone candle holders, possibly hundreds of years old.  The red spots on these rocks are natural and our guide says not animal blood,  Could they be a result of thousands of ceremonies held in this spot?