La Santísima Trinidad de Paraná, or the Most Holy Trinity of Paraná, is the name of a former Jesuit reduction in Paraguay. It is an example of one of the many Jesuit reductions, small colonies established by the missionaries in various locations in South America, such as Brazil, Argentina and Paraguay throughout the 17th and 18th century. These missions were built as self-contained societies that existed outside of regular Spanish colonial life that integrated indigenous populations with Christian faith.
La Santisima Trinidad de Paraná, often referred to by the locals as simply the "ruins of Trinidad" was one of the last of the Jesuit reducciones to be built in the Paraná River area encompassing southern Paraguay and northern Argentina. It is also the most highly accessible and the most visited of the historical sites today.
Wikipedia https://en.wikipedia.org/wiki/La_Santísima_Trinidad_de_Paraná
Official Website http://whc.unesco.org/en/list/648
Address Paraguay
Coordinates -27°7'53.14" N -55°42'11.436" E