Aztec Ruin in the Middle of Mexico City.

Archaeologists found an Aztec monolith in the middle of Mexico City:

The monolith and an altar, dating from the 15th Century, were unearthed in the very heart of the busy capital city.

The city’s mayor described the discovery as the biggest in almost three decades.

A figure representing the rain god Tlaloc and another unidentified figure are carved into a frieze on the altar.

The discoveries were made near the ruins of the civilisation’s main temple, the Templo Mayor, near the city’s central Zocalo Square.

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