In 1908, President Theodore Roosevelt issued an executive order establishing Tumacácori National Monument.  Stabilization of the church ruins began in 1919 with donated funds, making every effort to maintain their historic integrity.  Tumacácori's enclosed wall, visitor center, exhibits, and garden were added in the 1930s.  As the science of preserving old buildings matured, further stabilization was performed in the 1980s.

Congress expanded the original national monnument into a national historical park encompassing Guevavi and Calabazas in 1990.  After more than 200 years, three early Spanish colonial missions had been reunited under the protection of the National Park Service.
 

That these missions were built, let alone maintained, under trying circumstances for nearly 140 years is a testimony of the courage and tenacity of the valiant individuals who lived and died here: the priest who left his home and familiar surroundings and dedicated his entire life to teaching what he perceived as a better way of life to the inhabitants of the frontier; the Pima or Yaqui family who came to the missions in search of a better life, often to be killed by Apaches or stand helplessly by as their little ones were dying from strange and unfamiliar diseases; the Spanish or Mexican soldier, living at the presidio at Tubac, who laid his life on the line in defense of the missions; and lastly, the Apache, reacting in the only way he knew to a constant pressure from the Comanches, who were under pressure from white settlements encroaching from the east.

Visitor Center/Museum	Garden
The Franciscan Church	The Jesuit Church
The Convento	The Ki and Ramada
Granary	Mortuary Chapel / Cemetery
Lime Kiln	Mission Water Supply
Guevavi	Calabazas