One of the most impressive structures, the Pyramid of the Sun, is full of new surprises.

Once there, they discovered a rare cache of treasures.

The mask itself is extremely lifelike, which gave rise to the theory that it’s actually a portrait.

Pyramid of the Sun in Teotihuacan

Photo:Stock Photosfrom Barna Tanko/Shutterstock

This would be incredible, as archeologists have little information about the people who constructed Teotihuacan.

There are also conflicting theories about the exact use of the pyramid.

Even the name isn’t original.

Serpentine Mask Found at the Pyramid of the Sun in Mexico

Photo: INAH

The original name of the world’s third-largest pyramid remains unknown.

Teotihuacan was a thriving city once called the City of the Gods.

At its peak, 200,000 people called it home.

In fact, more recently, an underground tunnel was found under the nearby Pyramid of the Moon.

By using electrical resistance technology, they were able to map the tunnel without breaking ground.

Hopefully, these cumulative findings will shed more light on this great civilization and reveal more about its demise.