Early aircraft navigation was primitive. Traveling through the skies mostly relied on visual landmarks on the ground.
With the dawning of airmail service in the 1920s, improvements became highly desirable, and this led to the construction of a continent-spanning network of concrete navigational arrows pointing in the correct direction for planes to follow.
Originally, each arrow was accompanied by a tower with a beacon. This allowed planes flying at night the ability to follow a course from light to light. Most of the towers have long since been salvaged for scrap, but a remarkable number of arrows remain. Most are remote and hard to reach, but this one is just off Interstate 80 on the west side, about 10 miles northeast of Lovelock, Nevada.