Step into the enigmatic world of Teotihuacan, the "City of the Gods" that once rivaled Rome in size and grandeur but vanished into mystery centuries before the Aztecs arrived. This archaeological marvel, investigated on Expedition Unknown, offers visitors the chance to walk among massive pyramids and explore one of ancient America's most perplexing civilizations. Experience the same awe that captivated researchers as they uncovered clues about this lost metropolis that dominated Mesoamerica for over 500 years.
Teotihuacan is an ancient Mesoamerican city located in the State of Mexico, approximately 40 kilometers (25 miles) northeast of modern-day Mexico City. The site is dominated by two massive pyramids — the Pyramid of the Sun and the Pyramid of the Moon — connected by the Avenue of the Dead, which runs through this vast archaeological complex. At its height, likely between 100 and 500 CE, the city covered eight square miles and housed an estimated population of around 100,000 people, potentially making it the sixth-largest city in the world at that time. Gates investigated this mysterious metropolis to explore its enigmatic origins, sudden collapse around 550 CE, and the enduring question of who actually built it, as it predates the Aztec Empire by many centuries.
Teotihuacan established as a settlement in the Valley of Mexico
City reaches its zenith, becoming the largest city in the pre-Columbian Americas with major pyramid construction
Major monuments sacked and systematically burned; city begins decline
City largely abandoned, though exact timeline remains debated
Josh Gates investigates the lost city for Expedition Unknown
Mainstream archaeology recognizes Teotihuacan as one of the most significant urban centers in the pre-Columbian Americas, though many fundamental questions remain unanswered. The city's name itself is actually Aztec — meaning "the place where the gods were created" — given centuries after abandonment by the Mexica people who discovered the ruins and claimed spiritual kinship with its unknown builders. Archaeologists have documented Teotihuacan's massive scale and sophisticated urban planning, including multi-floor apartment compounds that housed the majority of the valley's population, but the original name of the city and the language spoken by its inhabitants are lost to history.
The ethnicity of Teotihuacan's builders remains genuinely debated among experts. Candidates include the Nahua, Otomi, or Totonac ethnic groups, though many scholars now believe the city was multi-ethnic, evidenced by archaeological finds connected to Maya culture and Oto-Pamean peoples. The city's influence extended throughout Mesoamerica — Teotihuacan-style artifacts and architectural elements appear in sites from Veracruz to Maya territories, suggesting either trade networks, political influence, or actual Teotihuacano presence at distant locations. Whether Teotihuacan functioned as the center of a state empire or as a primarily religious and economic hub remains contested.
The city's collapse around 550 CE is one of Mesoamerica's great mysteries. Archaeological evidence shows that major monuments were deliberately sacked and systematically burned, but whether this was internal uprising, external invasion, or ritual termination is unclear. Some researchers have suggested connections to the extreme weather events of 535-536 CE, which caused widespread climate disruption globally. Gates' investigation explored these competing theories, presenting the evidence without claiming definitive answers — an honest approach to a site where even experts acknowledge significant gaps in understanding.
Teotihuacan's legacy profoundly influenced later Mesoamerican civilizations. The Aztecs, encountering the ruins centuries later, incorporated Teotihuacan's cosmology and architectural principles into their own culture at Tenochtitlan. The site's export of fine obsidian tools throughout the region and its vibrant, well-preserved murals demonstrate a sophisticated civilization whose achievements remain impressive even as fundamental questions about its people persist.
At its zenith, Teotihuacan housed an estimated 100,000 people, potentially making it the sixth-largest city in the world during its era, yet the Aztecs who later found it abandoned had no idea who built it
The city covered eight square miles, and 80 to 90 percent of the entire valley's population lived within Teotihuacan during its height
The major monuments were systematically burned around 550 CE, but residential areas show continued occupation for possibly another 200 years, suggesting a complex collapse rather than sudden total abandonment
Teotihuacan exported fine obsidian tools found throughout Mesoamerica, making it a major economic center in addition to its religious significance
Teotihuacan is one of Mexico's most accessible major archaeological sites, located about 40 kilometers from Mexico City with regular bus service and tour options available. Visitors can climb both the Pyramid of the Sun and Pyramid of the Moon, walk the Avenue of the Dead, and explore residential compounds with preserved murals. The site is expansive — covering eight square miles — so plan several hours for a thorough visit and bring water, sun protection, and comfortable walking shoes.
Mexico City, approximately 40 kilometers (25 miles) southwest
The dry season from November through April offers the most comfortable weather for exploring the largely unshaded site. Early morning visits help avoid both midday heat and peak tourist crowds, particularly on weekends when the site draws many visitors from Mexico City.
UNESCO World Heritage Site
Mexico Mayan Sites
Other major pre-Columbian Mesoamerican archaeological sites investigated by Gates, exploring the mysteries of ancient American civilizations
Angkor Archaeological Complex
Another massive ancient city that thrived and then mysteriously declined, with monumental architecture and debated collapse theories
Sac Balam
Lesser-known Mayan archaeological site also investigated by Gates in Mexico, part of the broader exploration of Mesoamerican civilizations
Best time to visit: Visit during the dry season from November to April for comfortable weather and clear skies ideal for photography and pyramid climbing.
Travel tip: Arrive early morning to avoid crowds and heat, and bring plenty of water as the site offers limited shade while exploring the expansive complex.
Historical data sourced from Wikipedia