Archaeologists have unearthed a tremendous find in Mexico City; an Aztec temple, complete with an altar.

Mexico City, Mayor Alejandro Encinas says the ruins date back to the 15th Century and were a part of the empire's main temple.

Encinas says experts believe the Aztecs began work on the structure in 1375, and now stands only yards away from what has become the modern downtown of the Mexican capital.

The Mayor explains, "It is a very important discovery, the biggest we have made in 28 years. It will allow us to find out a lot more."

According to CNN, it was first excavated in 1978 after electricity workers found an eight-ton carving of an Aztec goddess. It was uncovered last weekend near the city's main Zocalo square along with the 11-foot stone slab, most of which is still buried under earth. Archaeologists are still unearthing the monolith which they think might be part of an entrance to an underground chamber.

Since much of the city was destroyed by Spanish conquistadors, there is still a hope that since this area was untouched, it may have escaped destruction.