The 80-year-old concrete arrows that helped deliver the mail

Travel in a straight line between New York and San Francisco and you might find a strange set of concrete arrows on the ground. The arrows — set into anonymous hillsides and nondescript scrubland — were laid down by the US Postal Service in the 1920s. Prior to the invention of radar and other modern flight planning implements, pilots would have difficulty navigating the coast-to-coast route over the American midwest: the arrows, when combined with a fifty foot tower and a powerful gas light, would help them find their way.

America’s first transcontinental air postal route was opened on August 20th, 1920. The first pilots to fly the route had to rely on landmarks to guide their way across the land, making the journey near-impossible…

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