The Purépecha name for Ihuatzio is sometimes rendered as "Jiuatsio" -- the house of the coyote. Its Nahuatl name, Cuyacan, carries the same meaning. The settlement occupies a low-lying plateau at the extreme western end of Lake Pátzcuaro, a position that was strategically vital: from here, the Tarascan leadership could monitor lake traffic and control access to the basin's western reaches. Archaeological evidence suggests the first occupation dates to between 900 and 1200 CE, when Nahuatl-speaking groups settled here. By the time the Purépecha consolidated their empire around 1440, Ihuatzio had become one of their three most important centers. The Purépecha were unlike any other Mesoamerican civilization. Their language is a complete isolate, unrelated to any neighbor's tongue. They were among the few peoples in the Americas to forge metal tools and ornaments. And they stopped the Aztec Empire cold at their borders, fortifying and patrolling their frontiers so effectively that scholars consider them the creators of Mesoamerica's first truly territorial state.

What makes Ihuatzio architecturally unique is not its pyramids but its walls. The Calzada del Rey -- the King's Road -- consists of enormous elevated causeways roughly 250 meters long, 20 meters wide, and more than 5 meters high, built from layered stone and earth with flattened surfaces on top flanked by low protective walls. Nothing like them exists at any other known site in western Mexico. Archaeologists believe these causeways served as ceremonial processional routes, carrying the Cazonci -- the Purépecha king -- from the ceremonial center to various points within the settlement. The Huatziris, or walled causeways that encircle much of the site, served a dual purpose as both roadways and defensive barriers. Standing about 2.5 meters high, their rock-and-earth cores were covered with stone slabs and finished with stucco. These defensive walls and walled roads are the signature features of Ihuatzio, forming an integrated system of communication and access control.

In the southern sector of Ihuatzio stands a building found nowhere else in Michoacán, or indeed in any registered archaeological site across Guanajuato and Jalisco. It is a cylindrical structure on a circular base, with no well-defined entrance. Its purpose remains genuinely unknown. Given its strategic hilltop position overlooking the lake and the surrounding volcanic mountains, some researchers speculate it served as a celestial observatory or watchtower. Others simply call it the Mirador -- the viewpoint. The main ceremonial platform, 87 meters long and 37.5 meters wide, supports two east-facing pyramidal structures with stairways that once rose in eleven stepped tiers. Their basalt stone cores were once entirely sheathed in carved xanamu stone blocks, though weathering has stripped almost all of that finishing away. The palace compound included a room dedicated to a grim purpose: storing the heads of enemies killed in battle.

On July 29, 2024, an unusually intense rainstorm heavily damaged one of Ihuatzio's pyramids. The destruction was worsened by structural weaknesses from years of drought and high temperatures -- a reminder that these ancient monuments face threats both ancient and modern. Officials pledged to restore the damaged structure to preserve what they called the region's cultural heritage. Formal excavation of Ihuatzio did not begin until the 1930s, centuries after the site was largely abandoned following the Spanish conquest. Archaeologist Efraín Cárdenas led significant work in the early 1990s, but the site remains only partially explored. The Purépecha people, meanwhile, never disappeared. Their language is still spoken with pride near Lake Pátzcuaro, their traditional crafts still fill local markets, and their ball games -- played with a flaming ball and hockey-like sticks -- still light up the night at cultural festivals held at the nearby ruins of Tzintzuntzan.