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In 1924, the U.S. government needed a way to ensure that pilots on the airmail route across the country would find their way to their destination at night or in bad weather.
The solution? A series of 70 ft. arrows with 50 ft. high lit towers running from New York across the country to San Francisco.
Much like lighthouses along the coast, these arrows and towers were near houses where the people maintaining the light towers would live throughout the year.
After navigation through radio signals became widely implemented post-WWII, these arrows and towers were rendered obsolete, and many were destroyed.
There are still a few arrows left across the country, and they certainly are head-scratchers for people who have never heard of this government mandated project.