April 16, 2015 – Imagine coming upon a large concrete arrow lying flat on the ground out in the middle of nowhere. Many hikers have been puzzled by such a discovery. Some arrows are as long as 70 feet.
Before radio and electronic navigation made them obsolete, these structures served as directional markers to pilots hauling the mail across the country by air. At least a hundred of the markers, built in the 1920s, still exist. Enthusiasts have begun mapping these relics.
Link: DailyMail
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