Twenty miles north of the Mexico border you'll find Tumacácori National Historic Park, a Jesuit mission founded by Spanish Padre Eusebio Francisco Kino in 1691 and the location a bloody O'odham Indian uprising in 1751.
Inside, a cross made of flowers adorns the crumbling chancel wall.
Outside, a grave with no name is covered in stones.
At Casa Grande National Monument, the eroding walls from a 13th century Hohokam Indian village are the only remaining sign of an ancient civilization that flourished for centuries before disappearing into the folds of history.
Now a ghost town, Fairbank on the San Pedro River was a once a thriving depot town during the height of the silver and copper mining era in the late 1800's.