When United States Post Office planes took to the skies in the 1920s, they had their own version of the roadway’s yellow line. A series of giant concrete arrows and gaslight beacons helped point the way from New York to San Francisco. via Pocket http://io9.com/these-concrete-arrows-point-the-way-across-america-1466295017
Filed under: My Amazing World Tagged: IFTTT, Pocket
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