Exploring Mayan Cities

I love visiting ancient cities and temples (i try to avoid saying ruins -- as it suggests something old and not meaningful).  I've visited Chi'chen Itza twice, Uxmal (three times- my favorite, Coba (twice), Tulum and some smaller sites. We'll make a quick stop at Tulum.

This will be my first time to Calakmul. 

Here is an interesting video -- listen to that howler monkey. Can you all make that sound?

I've been reading a lot to understand how the Mayan  in these times made sense of sacrifice and death. It is a stretch for us foreigners...but i have glimmers of starting to understand the world view beneath it.