A Mayan city from the classic epoch on the Yucatan peninsula, south of Mérida.
My suggestion
You should visit the site in the morning and then go to one of the numerous cenotes in the area to cool off during the afternoon as it's really hot in the area!
The north and south are two different worlds, not only in terms of their landscape but also their economic structures. On this one strip of land fierce industrialization contrasts with a laid back tourist lifestyle.