Arivaca Schoolhouse - Credit: Wikimedia Commons
The Arivaca Schoolhouse is a historic one-room school building located in the unincorporated community of Arivaca, in southern Pima County, Arizona. A small and simple structure made of locally manufactured mud adobe bricks, the Arivaca Schoolhouse was built in 1879 and is the oldest standing schoolhouse remaining in Arizona. It was added to the National Register of Historic Places on April 16, 2012, and is now used as a center for community activities. Read more on Wikipedia
Source: en.wikipedia.org