Archaeologists in Mexico found a human burial site in Mexico City's Templo Mayor containing the skeleton of a young woman, reported the El Paso Times.
But the strange thing, the "unprecedented" thing, is that this mystery woman was surrounded by piles of 1,789 human bones.
The National Institute of Anthropology and History told FOX News the Aztecs were not a mass sacrificing kind of people, and are not known for reburying bones to accompany its ruling citizens.
University of Florida archaeologist Susan Gillespie said on Tuesday the Mayas buried sacrificial victims with royalty, but these corpses were usually discovered intact.
"Although the bodies of sacrificial victims have been found in burials of elite persons in Mesoamerica going back to at least the Preclassic period, funerary deposits for Aztec elites have only rarely been encountered," Gillespie wrote in an email to FOX News.
The burial dates to about 1481 to 1486.
The Associated Press reported some bones appeared to have cut marks on sternums and vertebrae. Archeologists speculate that if a ritual heart extraction were preformed, these bones would be marked.
However, it is unlikely that anyone was sacrificed at the archeological site because the corpses were not intact, their bones scattered about the site.
So far, this history is a mystery.