Just follow the giant concrete arrows on the ground!

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In 1924, the Federal Government actually paid to have giant concrete arrows poured, and painted yellow along a route from New York to San Francisco, to help guide airmail pilots. Fifty foot tall towers with gas powered spotlights were built right next to the arrows, like inland lighthouses. Most of the towers are now gone, but many of the arrows remain.  Check out the full article from Messy Nessy.

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