The stonework is from the Teotihuacans. Just incredible stuff. I impatiently await the invention of time machine tourism!
“Teotihuacan’s control of the obsidian mines at Otumba and Pachuca allowed it to centralize the production of obsidian goods, some for domestic sale, the rest for export. With this, and its monopoly on the distribution of Thin Orange pottery, Teotihuacan developed a trading system that embraced almost every region of Mesoamerica, including places as far away as the Maya area, the modern state of Guerrero, and the area around the Gulf of Mexico.
Teotihuacan’s metropolitan feel, its trading system, and the religious prestige it accrued from its giant pyramids and related ceremonies, attracted a floating population that enriched the quality of life in the great city. At its peak between 150—450 CE, it stretched over 30 square km and had a population of between 150,000 and 250,000.
After flourishing for centuries, Teotihuacan collapsed c. 750 CE, partly due to adverse pressures from the new population centers that sprang up on the Mexican plateau. However, evidence of fire, and the systematic, devastating ways in which the buildings lining the Avenue of the Dead were destroyed point to the main cause of its collapse being internal rebellions.”