Teotihuacan's sheer scale is staggering, and the fact that its true origin remains one of archaeology's greatest mysteries makes it even more compelling.

Looking directly down at the Pyramid of the Sun highlights just how massive its footprint is. Measuring roughly 220 by 230 meters (720 by 760 feet) at its base, it covers almost the same ground area as the Great Pyramid of Giza, standing 66 meters (216 feet) high.

​Key Facts Behind the Mystery

​The Unknown Builders: The city flourished between roughly 100 BCE and 550 CE, holding an estimated population of 100,000 to 125,000 people at its peak—making it one of the largest cities in the ancient world. Yet, the civilization left no written records, leaving their origin, language, and true name unknown.

​The Aztec Name: When the Aztecs arrived in the Valley of Mexico around the 14th century, the city had been lying in ruins for over 700 years. Struck with awe by the monumental architecture, they assumed it was constructed by giants or gods and named it Teotihuacan ("the place where gods were created").

​Urban Grid Alignment: The entire city was laid out on a precise geometric grid oriented 15.5 degrees east of true north, aligning with solar cycles and sacred calendar alignments.

​Subterranean Secrets: Modern excavations using subterranean radar and robotic rovers have revealed extensive artificial tunnels and chambers hidden directly underneath the Pyramid of the Sun and the Temple of the Feathered Serpent, filled with ritual offerings like carved greenstone statues and pools of liquid mercury.