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View of a fence with a "No Trespassing" sign alongside a dirt road. The fence is part of the Phelps Dodge Mining Facility.

The remains of a building and stairs at the Phelps Dodge Mining Pit.

View from Monument 179 looking southeast. In the center, a straight path leads towards a hill. Saguaros and shrubs also populate the landscape.

View of Monument 180 at Pinacate Lava Flow and Las Playas in Yuma County, AZ. A wire fence stands to the side of the monument.

Blackened plants indicative of fire damage and a wire fence marking the border between Sonora and Arizona.

A wire fence running in front of Monument 181 looking southeast. A white platform held down by rocks sits at the base of the monument.

Two saguaro cactus stand amid desert shrubs. In the background, more saguaros and mountains are visible

View from Monument 198 looking south east. A dirt path goes around and in between small peaks.

A small canal and bridge diverging from another canal. Next to it, a set of tire tracks are visible in the dirt.

View of the headgate where the Colorado River and Baja California meet looking south into "No Man's-land" along the border.

Monument No. 207, looking east-northeast 1/4 mile west of the port-of-entry at Andrade, California. Mexico is on the right.

A wire fence crossing several hills. Besides it, a dirt path extends into the distance.

Water flowing down the All-American Canal. Vegetation grows on both banks, and in the distance, hills line the sides of the canal.

A border fence approaches an arroyo at the San Pedro River. Trees line the other side of the arroyo.

View of the water in the All-American Canal. To the left, an irrigation structure known as a "drop" rises above the water.

View of the Buttercup Sand Dunes, located west of Yuma, Arizona. Tracks from all terrain vehicles are visible in the sand.

Remains of Old Plank Road buried under sand. A wire fence runs on the side of the planks, while footprints are visible in the sand.

Monument No. 210, looking southwest, near the Gray's Well area west of Yuma, Arizona. Although early monuments were equipped with flagpoles, this pole is used to mark the boundary under shifting sands. Even with the extension, the monument is often…

A dirt road with tire tracks. On the left, Monument 212 is visible in the distance. On the right, power lines run alongside the road.

Siphon drain split into two tunnels. Water from the Alamo River flows into the left tunnel, while light is visible at the end of the right tunnel. Markings have been engraved on the top of the drain and right wall.