At the center of it all stands the Manzana Jesuítica, the Jesuit Block, a single city square in Córdoba that held the order's church, the Monserrat secondary school, residences, and the National University of Córdoba. Founded in 1613, the university is the oldest in Argentina and the third oldest in all of the Americas, old enough that the city it anchors is still nicknamed La Docta, the Learned One. Lectures in theology and philosophy began here while Córdoba was still a remote outpost on the edge of the Spanish world, and for generations this single block trained the priests, lawyers, and statesmen of a vast interior. Its existence here was no accident. The Jesuits placed the temple of the mind at the heart of the colonial city and surrounded it with the rural engine that would pay for it, fusing the life of scholarship to the land in a way few institutions on the continent ever matched.

Begun in 1615, the five estancias, Caroya, Jesús María, Santa Catalina, Alta Gracia, and Candelaria, fanned out across the Córdoba hills, each with its own church, mills, residences, and elaborate hydraulic works to move precious water across dry ground. They were not idle retreats. They were factories and farms, producing grain, livestock, textiles, and even wine, and the income flowed back to sustain the college and university in the city. It was one integrated organism, urban brain and rural body, an experiment in self-sufficient religious enterprise carried on for a century and a half through the seventeenth and eighteenth centuries.

The estancias ran on people who could not leave. The Jesuits made a deliberate distinction that the buildings themselves cannot tell you: they did not enslave the local Comechingones, whom they aimed to convert and paid for their labor, but they enslaved Africans hauled across the ocean against their will. Enslaved men and women worked the fields, the mills, and the workshops alongside indigenous laborers, and the grace of these arcades and bell towers rests on their forced and unpaid work. The beauty is real. So is the bondage that produced it. To honor this site fully is to hold both at once and to remember the people whose suffering the official records so rarely named.

It ended by royal decree. In 1767 King Charles III of Spain expelled the Society of Jesus from his entire empire, and the Córdoba complex passed abruptly out of their hands. The Franciscans took over and ran the institutions until 1853, when the Jesuits returned to the Americas, though by then the world had moved on; the university and the secondary school were nationalized only a year later, in 1854. The order that conceived this ensemble had been gone for nearly a century. What it left behind, church and college, estate and mill, survived the centuries and now stands among the most remarkable colonial heritage in South America, a testament to ambition, faith, learning, and the unfree hands that made it possible.