Concrete Arrows Across the U.S. The U.S. landscape is still dotted with enormous concrete arrows that guided early airmail pilots across the country.

Two large concrete arrows sit atop Acalanes Ridge in Walnut Creek, Calif., photographed on Wednesday, Dec. 23, 2015. The arrows are part of a network of about 1,500 arrows, of slightly different ...

The concrete arrows were placed about every 10 miles between the stops, generally in remote areas often hard to get to. The Steamboat Ditch arrow fits that description.

Texas Country Reporter The Story Behind a 70-Foot Concrete Arrow Near Odessa A hundred years ago, U.S. airmail pilots depended on a coast-to-coast bread-crumb trail of arrows—though most have ...