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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.

Irrigation canals are spread throughout the border area. This view is as the intersection of the Alamo River and the All American Canal, at Monument Number 218, looking east. The canal acts as an artificial boundary directly parallel to the border…

View looking toward the spot where the first irrigation water from Colorado reached the Imperial Valley in 1901. Tire tracks lead towards a fence. Near the fence's gate, a sign reads: "".

View of the point-of-entry of New River at Calexico/Mexicali. The New River is so severely polluted that it is a major health hazard. A fence and bridge cross over the river, and to the left, several buildings stand behind another fence. Vegetation…

During President Carter's administration, the Immigration and Naturalization Service constructed an "impenetrable" fence at selected areas near El Paso, Calexico, and San Ysidro, among others. It is twelve feet high and constructed of metal webbing…

View from Monument 225. In the distance, two roads intersect while shrubs fill the landscape.

Image of the Pocket Spacecraft version of the OSIRIS-REx Spacecraft

View of a chain link border fence. A portion of barbed wire is missing from the top of the fence. In front of the fence, tire tracks are visible in the mud.

Tire tracks approach a pile of rocks, one of which reads "EX 7". This area is called the "corrals" by local people, and is located between Monument Numbers 228-229.

View from In-Ko-Pah Gorge. Several rocky mountain line the landscape while several roads run between them.

A single road leads towards a large hill. Small shrubs line both sides of the road.

A small fence leads towards some hills. Vegetation runs alongside the fence.

The United States closed their fence and customs office while the Mexicans keep their office opened. Nobody is supposed to cross at this point, but if they do, they can still pay their Mexican "crossing-fees", or mordida. Here, a customs house stands…

A dirt path winds between several trees. Fallen leaves from the trees cover the ground.

View of Monument 238, which stands between several shrubs. To the left, a small path is visible.

A winding path extends into the distance. Rocks and vegetation surround the path on both sides. In the distance, a gap in the vegetation serves to slow the spread of fire.

In 1907, by proclamation of President Roosevelt, all federal lands in California, Arizona, and New Mexico within 60 feet of the border line were set apart as a public reservation. Although this frontier is occasionally usurped by ranchers and…