Archaeologists in Mexico City’s ancient La Merced district have unearthed a pre-Hispanic mesoamerican sauna from the 14th century.

The BBC reports that several primary sections of the ancient sweat lodge still exist remarkably intact.

The Mesoamericans of the period built these ancestral saunas, known as temazcals, for medicinal, spiritual, and fertility purposes and rituals. Mexico’s National Institute of Anthropology and History (NIAH) said the find clarified a slew of historical questions.

Unearthing the pre-Hispanic site helped experts locate Temazcaltitlán — one of the very first settled areas of the ancient city of Tenochtitlán. The site was primarily used for purification ceremonies for the ill, for warriors after a battle, and for ensuring successful childbirth.

A foundation house and a colonial tannery were found at the site, as well.

Researchers believe Mexica nobles — the Mexica were the indigenous people of the Valley of Mexico who comprised the Aztec Empire between 1428 and 1521 — lived in the former between 1521 and 1620, while the tannery is currently dated to between 1720 and 1820.

For excavation lead Víctor Esperón Calleja, these discoveries have shed enormous light on the region’s history and culture.

“Tenochtitlán was divided into four parts and we are in the part called Teopan in a neighborhood called Temazcaltitlán where the sweat lodges were,” he said. “The [house and tannery] findings suggest that in the 16th century this area was more populated than we initially thought.”

The house, built after the Spanish conquistador Hernán Cortés took the Aztec city of Tenochtitlán and defeated Moctezuma II in 1521, was decorated with red motifs on the interior walls.

Researchers believe its owners were a noble and respected family. Tenochtitlán was, after all, a major metropolis home to a wide stratum of social and economic classes in Aztec society.

“The site is part of a protected area and that is why Archaeological Rescue Office of the INAH has intervened,” said Calleja in reference to the INAH taking the lead on this discovery.

In terms of the temazcal’s size, INAH confirmed the foundation is 16.4 feet long and 9.7 feet wide. A bathtub and a bench were built into its walls, the discovery of which lends credence to another known historical record.

An Aztec record says that a Mexica noblewoman named Quetzalmoyahuatzin regularly bathed in a temazcal before giving birth. Now that a sweat lodge like the one described in this record has actually been discovered, that written document is largely verified as fact.

Researchers believe the whole neighborhood was one centered on worship, and not just of Tlazolteotl — the Aztec deity dedicated to purification, steam baths, lust, and vice.

Other deities such as Ixcuina, the goddess of labor, Ayopechtli, the goddess of birth itself, and goddesses who represented land or water — such as Coatlicue, Toci, Chalchiuhtlicue, and Mayahuel — were honored there, too.

As it stands, there may be further revelations stemming from this discovery that’ll contextualize this history even more.