"The Templo Mayor With the Spanish conquest of the Aztec empire, Iberian overlords set about imposing their customs on the subdued populace, eliminating traces of pre-Hispanic religions they deemed heretical by demolishing major temples and building churches and other structures atop their ruins. Centuries later, in 1978, workers laying electrical lines happened upon the remains of the Templo Mayor, the Aztecs’ most important ceremonial center (and, yes, the location of their notorious human sacrifices). Subsequent excavations have revealed superimposed pyramid foundations and priceless artworks, many now displayed at the on-site museum. Thrillingly, treasures keep turning up—including the spring 2017 discovery of a stone box containing some of the finest Aztec gold ever found, just off the Templo Mayor's steps."