A worker displays the skull of a Spanish woman at the Zultepec-Tecoaque archeological site in Tlaxcala state, Mexico, Thursday, Oct. 8, 2015. According to government archaeologists, this woman was sacrificed in the town plaza, dismembered, and then had the skull of a 1-year-old child, who apparently was sacrificed as well, placed in her pelvis, for reasons that were probably symbolic and remain unclear. (AP Photo/Rebecca Blackwell)
A worker rebuilds a toppled wall using rocks found inside the Zultepec-Tecoaque archeological zone in Tlaxcala state, Mexico, Thursday, Oct. 8, 2015. Explorations of the Aztec-allied town began in the 1990s. (AP Photo/Rebecca Blackwell)
A worker clears the area around broken pottery lying in situ at the Zultepec-Tecoaque archeological site in Tlaxcala state, Mexico, Thursday, Oct. 8, 2015. The inhabitants of the Aztec-allied town are known as Texcocanos or Acolhuas. (AP Photo/Rebecca Blackwell)
Newly excavated items soak in clean water after being cleaned at the Zultepec-Tecoaque archeological site in Tlaxcala state, Mexico, Thursday, Oct. 8, 2015. The bloodiness of the brief chapter of dominance by indigenous group over Spanish conquistadors is sealed in the second name of the Zultepec ruin site, Tecoaque, which means the place where they ate them in Nahuatl, the Aztecs language. (AP Photo/Rebecca Blackwell)
The skeletons of sacrificed Spaniards are displyed inside a glass case at the museum of the Zultepec-Tecoaque archeological site in Tlaxcala state, Mexico, Thursday, Oct. 8, 2015. The convoy of conquistadors was comprised of people sent from Cuba in a second expedition a year after Hernan Cortes initial landing in 1519, and was heading to the Aztec capital with supplies and the conquerors possessions. Here, the Spanish conquistadors suffered one of their worst defeats in Mexico. (AP Photo/Rebecca Blackwell)
A field of oats, believed to be covering temples and structures, grows next to excavated sections of the Zultepec-Tecoaque archeological site in Tlaxcala state, Mexico, Thursday, Oct. 8, 2015. While Spaniards later wrote accounts of a massacre that occurred here in 1520, archaeologists are finding things they didnt mention, like the presence of women and children in the conquistadors' convoy. (AP Photo/Rebecca Blackwell)
Mesoamerican Archaeologist Dr. Enrique Martinez Vargas shows a horse's rib marked with cuts, at the Zultepec-Tecoaque archeological site in Tlaxcala state, Mexico, Thursday, Oct. 8, 2015. According to government archaeologists, the native Mexicans sacrificed, and apparently ate, the horses, men and women who arrived in a convoy of Spanish conquistadors who initially landed in 1519. (AP Photo/Rebecca Blackwell)
Mesoamerican Archaeologist Dr. Enrique Martinez Vargas organizes shards of excavated pottery which workers hope to reassemble, at the Zultepec-Tecoaque archeological site in Tlaxcala state, Mexico, Thursday, Oct. 8, 2015. According to artifacts found at the site, the inhabitants of this Aztec-allied town carved clay figurines of the members of a convoy of Spanish conquistadors who arrived to their city, then symbolically decapitated them, government archaeologists say. (AP Photo/Rebecca Blackwell)
A faint cross marks a stone inside a cell for prisoners, at the Zultepec-Tecoaque archeological site in Tlaxcala state, Mexico, Thursday, Oct. 8, 2015. According to government archaeologists, members of a captured convoy of Spanish conquistadors were held prisoner in doorless cells like this one, where they were fed over six months. (AP Photo/Rebecca Blackwell)
The skull of a Spaniard, bottom left, a child, center, and a person of African heritage sit alongside models of what a Spanish conquistador and a person of mixed Amerindian and African descent may have looked like, at the Zultepec-Tecoaque archeological site in Tlaxcala state, Mexico, Thursday, Oct. 8, 2015. Faced with the invaders accompanied by unknown animal species, the inhabitants of the Aztec-allied town just east of Mexico City captured a convoy of about 15 Spaniards, 45 foot-soldiers _ including Cubans of African and Indian descent _ women, and 350 Indian allies of the Spaniards, including Mayas and other groups. (AP Photo/Rebecca Blackwell)