The death god, Mictlantecutli, is often depicted with a skull-like face in pre-Hispanic artefacts.
It's even home to some bizarre-looking Xoloitzcuintle dogs, a rare pre-Hispanic, hairless species.
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Walls and ceiling are covered with psychedelic pre-Hispanic imagery: maguey plants, Aztec gods and goddesses, plumed serpents and skull racks.
On the one hand, the great pre-Hispanic civilisations of the Aztecs and the Maya have been held up as symbols of Mexican identity.
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Other activities include having a temascal, a pre-Hispanic wood-fired steam bath, which can be a good option at the end of a long hike.
In one of the caves, the experts found depictions of the atlatl, a pre-Hispanic hunting weapon that had not yet been seen in other paintings in the Tamaulipas state.
There was a talk about Mexican pre-Hispanic civilizations, and Slim himself lectured on the renovation of Mexico City's historic center, for which he has reportedly been paying.
Mexico and Peru, with their rich heritage of pre-hispanic architecture, have long had an eye on the past, and are zealous in preserving their Spanish colonial towns.
The paintings are being considered an important find because they document the presence of pre-Hispanic peoples in a region where "before it was said that nothing was there", Mr Ramirez said.
According to the preliminary program, there's a lecture on Mexican pre-Hispanic civilizations and a talk by Slim himself on the restoration of Mexico City's historical center--for which Slim has been reportedly footing the bill.
One block north lie the pre-Hispanic ruins of Templo Mayor, believed by the Aztecs to be the centre of the universe, and just a stone's throw from the site is Palacio Nacional, which houses dramatic Diego Rivera murals.
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