Presidio San Agustin del Tucson

In August 1775, Spanish soldiers under Captain Hugh O'Conor planted a flag on the east terrace above the Santa Cruz River and claimed the ground for the Presidio San Agustín del Tucson. The site sat near the O'odham village of Cuk Ṣon — "black base," for the dark rock at Sentinel Peak's foot — and the Spanish built what they came to build: a fort to hold the frontier against Apache raids.

The following year, soldiers marched north from Tubac and began construction. At first it was timber palisades and scattered buildings. Funds earmarked for adobe walls disappeared into mismanagement. Then in June 1782, Apache warriors nearly overran the place. By May 1783, the walls were finished: adobe, roughly 670 feet to a side, square towers at the northeast and southwest corners, three feet thick and tall enough to matter. Inside were homes, stables, storehouses, a chapel along the east wall, the commandant's house at center. The main gate faced west.

Tucson survived under Spanish rule, then Mexican after 1821, then American after the Gadsden Purchase in 1853. The garrison stayed until 1856. After that, the walls came down — dismantled for building material, buried under parking lots, forgotten. The last standing section was torn down in 1918. Two local women made a plaque to mark where it had been.

In 1954, a boarding house was demolished for a parking lot. Archaeologists excavated the site and found a three-foot-thick portion of the northeastern bastion. The parking lot was built anyway. Decades later, new excavations located the bastion again, along with the east wall, soil pits, and trash-filled pits from the presidio period. In 2007, the northeastern corner was reconstructed as a museum.

What stands now at 196 North Court Avenue is not the original fort — it's an honest recreation of the corner where Tucson began, built over the excavated footprint of the tower that anchored the northeast wall.