The 2,000-year old constructions are thought to have been important in rituals observed by the Olmec culture.
Archeologists digging in Mexico southeastern state of Yucatán discovered a centuries-old palace built by the Mayans more than 1,000 years ago.
Wild animals played a significant role in ancient Mesoamerican culture.
King Pakal the Great ascended to the throne aged 12, ruling over the city state of Palenque during its golden age.
"We now have to consider that complex societies may have formed in the tropics and made their way outward from there."
The cave stretches more than 200 miles.
Archaeologists are hoping to find what lies beneath the large Mayan temple known as "The Castle."
In Guatemala, dissenting villagers face violent attacks, arson and intimidation from supporters of a burgeoning mining industry