- The presence of obsidian, a volcanic glass, at Teotihuacan. Obsidian is not naturally found in the area around Teotihuacan, and so it must have been brought from elsewhere. This suggests that Teotihuacan had trading networks that extended as far as the obsidian mines in the Valley of Mexico and the Sierra de las Navajas.
- The presence of foreign artifacts at Teotihuacan. Archaeologists have found artifacts at Teotihuacan that originated in other parts of Mesoamerica, such as the Maya region and the Gulf Coast. This suggests that Teotihuacan was involved in trade and exchange with other cultures.
- The construction of Teotihuacan. The city of Teotihuacan is evidence of the people’s engineering and architectural prowess. The city was planned and constructed on a massive scale, and it required a great deal of manpower and resources to build. This suggests that Teotihuacan had a strong central government and a well-organized society.
In addition to these specific pieces of evidence, there are a number of other factors that suggest that the people of Teotihuacan traveled great distances. For example, the city is located at a crossroads of several important trade routes, and it is also surrounded by a number of natural resources, such as obsidian, jade, and other valuable materials. These factors would have made Teotihuacan a natural hub for trade and commerce, and they would have also made it a desirable destination for travelers from other parts of the world.