The secret inside the Sun Pyramid

Archaeologists say they have found artifacts used in a religious ceremony before the Pyramid of the Sun began to be built.

Conducting research inside Mexico's tallest pyramid, the team discovered a green serpentine mask with delicate carvings that they believed belonged to a portrait.

Many mysteries still exist within the Sun Pyramid.

Besides, according to the report of the National Institute of Anthropology and History (INAH), 11 clay jars used for ritual worship of the Tlaloc rain god, the bones of an eagle eating rabbits with species Cats and dogs are also found in a rubble dating back to 50 AD.

'We believe that this is part of the ritual of sacrifices for the gods to allow them to carry out the construction of the Sun Pyramid ,' said archaeologist Enrique Perez Cortes.

Experts went inside the pyramid with a dug tunnel from the 1930s. Here, they were amazed to find more signs of seven bodies, including babies, there were could be victims used to sacrifice.

George Cowgill, an anthropologist from Arizona State University, claims this is an 'important' discovery . Artifacts related to the Tlaloc sacrifice may raise a debate about whether or not the connection between the pyramid - the sun, and Tlaloc is also considered a war god.

The Sun Pyramid is the most sophisticated architectural achievement in Teotihuacan in the Mayan civilization. Teotihuacan city was built nearly 2,500 years ago, is the commercial and cultural center of ancient Mexico.

However, the identity of its ruler is still a mystery. The name of the Sun Pyramid was attributed to the Aztecs who visited Teotihuacan after it was abandoned.