The significant archaeological site that revealed much about Mesoamerican cultures is Teotihuacan, located near modern-day Mexico City. This ancient city was one of the major urban centers of Mesoamerica from around 100 BCE to 750 CE, known for its impressive architecture, including the Pyramid of the Sun and the Pyramid of the Moon. Excavations at Teotihuacan uncovered a wealth of artifacts, murals, and residential complexes, highlighting the city's complex social structure, economic systems, and cultural practices. The extensive use of obsidian and trade networks demonstrated the city's role as a significant cultural and economic hub that influenced various Mesoamerican civilizations, including the Aztecs.