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Unlocking long-sealed cave may solve Mexican pyramid mystery
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.
According to a report in the Telegraph, the tunnel entrance was discovered by accident in 1971 while workmen were installing a sound and light show.
After initial tests, it was dismissed as a natural cave and sealed two years later.