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View of a burned mesquite along the Arizona/Sonora border.

Monument No. 172 and sentry cacti near Aguajita Spring west of Lukeville, Arizona, and Sonoita, Sonora.

“International Boundary” sign within Organ Pipe National Monument marking the U.S. border with Mexico. Behind the sign, several large saguaros are visible.

View from Monument 165 looking southeast towards Organ Pipe National Monument. Two dirt roads run on each side of a fence, while a telephone pole is visible overhead.

View of the Sierra de la Nariz mountain range at Monument 160.

A dirt road leads to the gate at Taro's Ranch. Saguaros and shrubs are visible behind the gate.

View of a crested/cristate saguaro next to a large shrub.

Several saguaros stand tall behind a wire fence. Small shrubs also populate the space.

[Note: Revised for appropriate name of the Tohono O’odham Nation]: The border line divides the Baboquivari Mountains and cuts through the Tohono O’odham Nation. Many washes and arroyos, such as the Gu Oidak, San Simon, and Altar, intersect the…

View, looking east, towards Monument 63. Also visible are the effects of grazing habits with Mexico on the right and the United States on the left.

View of Monument 144 beneath two trees. A dirt path flanked by vegetation leads to the monument.

Front facing view of the Vamori Gate near Monument Number 147. A dirt road leads towards the gate, while vegetation is visible beyond it.

View of a water tank from the Presumido store. Vegetation surrounds the tank on all sides.

View of the abandoned Presumido store and water tank at the base of a hill. In the foreground, a lone saguaro is visible.

An abandoned swimming pool surrounded by wire fence on one side and brick wall on the other side. A building is visible behind the wall.

View of the border fence and Monument No. 121, near the port-of-entry at the twin towns of Nogales, Sonora and Arizona. Mexico is on the left.

View from Monument 120 looking west into the twin towns of Nogales, AZ and Nogales, Mexico.

View from Monument No. 120, looking east into "Smuggler's Gulch," near Nogales, Arizona and Sonora. Mexico is on the right. Rural routes are often used to smuggle consumer goods into Mexico to avoid the high import taxes and bribes. Driving up to the…

View of the border fence near Monument 108, looking west. Vegetation lines both sides on the fence, and on the left, trees are visible.

View of a fence near Monument 106 with a sign that reads "U.S. Government Structure".