Traces of the ancient South American city can still be found in the roads and structures of modern Mexico.
Archaeologists have discovered a tunnel and chamber hidden beneath the 2,000-year-old Pyramid of the Moon.
Archaeologists have discovered a mysterious tunnel underneath the ancient city's Pyramid of the Moon.
Archaeologists excavating a subterranean tunnel below the ancient city have unearthed three new chambers.
Archaeologists have come across a number of strange spheres below an ancient pyramid in Teotihuacan.
Researchers have been using a special robot to explore tunnels below the ancient city of Teotihuacan.
A number of artefacts have been discovered within the Pyramid of the Sun at Teotihuacan in Mexico.
Archaeologists have discovered a tunnel under the Temple of the Snake in Teotihuacan, Mexico.
Archaeologists have used a robot to explore an ancient tunnel under the Teotihuacan ruins.