London, July 14 : A team of archaeologists are all set to open a long-sealed cave under a Mexican pyramid in the hope that it will unlock the mystery of one of ancient civilization''s greatest cities - Teotihuacan.
At its zenith between 150 AD and 450 AD, Teotihuacan was home to up to 200,000 people of various ethnic origins and thought to have been larger than any European city at the time, including Rome.
With its soaring stone pyramids and geometric temples, Teotihuacan was once the biggest city in the Americas and possibly the world.
But, sometime in the 7th or 8th century, it was set ablaze - possibly as the result of an insurrection - and abandoned.
The Aztecs believed the city was divine and identified it with the place where the sun was created.