Montello, Nevada, United States
by

Airmail Arrows

"In the 1920s, America began coast-to-coast Airmail service, but the pioneer pilots had trouble navigating the route, since navigation charts of the day were fugazi and you couldn't exactly pull over to ask a farmer for directions. And traveling at night, when it would have been most efficient, or in bad weather was impossible. To solve this Congress then funded these gi-normous arrow-shaped Airmail Beacons, some up to 70 feet long, to trace a route across the country."

It's pretty easy to spot from the satellite view. I may chain a bunch of these together to see if I can "fly" from San Francisco to New York. Others have found two so far:

40° 55.672', -114° 17.668'
40°42'16.31"N 112°15'13.00"W

http://www.core77.com/blog/transportation/what_are_these_giant_concrete_arrows_across_the_american_landscape_25236.asp

http://www.thedailybeast.com/articles/2013/12/19/the-strange-arrows-that-point-the-way-across-america.html

http://www.cntraveler.com/daily-traveler/2013/06/transcontinental-air-mail-route-maphead-ken-jennings

https://www.backcountrypilot.org/forum/giant-concrete-arrows-13055

Airmail Arrows