Location: La Placita Park 110 S Church Street Tucson, Arizona 85701 32.220970, -110.973215
Historical Significance: Commemorating the South Entrance to the Old Walled City, which was founded by the Spanish Government as a Presidio. The Old Walled City of Tucson became part of the United States after the Gadsden Purchase in 1853, and it was the largest city in the Gadsden Purchase.