Archaeologists in Mexico have discovered a square stone altar used for human sacrifices during the Toltec Empire over 1,000 years ago. The altar, along with human bones, obsidian knives, and ceramic vessels, were discovered during an excavation near the archaeological site of Tula. The discovery is part of the National Institute of Anthropology and History (INAH) and indicates that the human sacrifices may have been enemies offered after the Ttec defeated them. The remains of walls around the altar suggest it was located in a courtyard, and additional rooms are believed to have been part of a palace or other residential structure housing ancient Tula's elite. However, further research will be required to learn more about the sacrificial victims.