San Ignacio Miní
Trip I made to the jesuit ruins in the south region of Misiones provice, Argentina.
It's called a jesuit reduction, run by spanish jesuit priests that intended to catholicize the guarani indigenous people and protect them from being captured and sold as slaves by the portuguese bandeirantes in Brazil.
These buildings were constructed in 1632 and abandoned in 1767 with the expulsion of the jesuits from all the spanish colonies. It became a UNESCO World Heritage site in 1983.