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International Monument No. 163, located in Organ Pipe Cactus National Monument in Arizona.
Old Monument No. 16, looking east, was built in the early 1850's to mark the U.S. - Mexico border. Courtesy National Archives (76-OM-1-144)
Images of monuments 2 on the U.S.-Mexico border.
Images of monuments 185 on the U.S.-Mexico border.
Monument No. 258, situated between the western boundaries of the U.S. and Mexico.
An 1894 photograph shows the southeast view of Monument No. 258, also known as Old Monument No. 1, after renovation and the erection of a protective fence.
Monument No. 210 is located a few miles east of Gordon's Well, Imperial County, California. Courtesy David Taylor, "Border Monument No. 210, N 32° 42.352' W 114° 54.596, 2009."