An interesting bit of American history. How hi-tech is that?
All across the USA, Seventy foot concrete arrows can be found in remote locations. They were constructed in 1924 to guide postal planes in the right direction as they carried mail from coast to coast.
The arrows and beacons bisect the United States from San Francisco to New York City.
The towers were 50 feet tall and fixed with gas lights that could be seen from 10 miles away in order to help lost pilots find their way. This is a model of the arrows and towers in their heyday.
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