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.

Crews are making gradual progress on concrete construction in some areas of Security-Widefield in advance of repaving later ...

Photos of the concrete barriers along the makai (ocean-facing) edge of Honoapiʻilani Highway show the ground beneath them has ...

Since entropy always goes up, and time always moves forward, there might be a connection there. It is, after all, the only serious place in physics where a concrete “arrow of time” appears. But ...

He describes the shell concrete, which he started developing in 2018, as “a conduit for both industries to actually think about the waste that they produce, the products they produce, ...

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 ...

But a large concrete double arrow, now covered by graffiti and offering no clue to its onetime purpose, still drapes over the crest of the ridge, only slightly visible from the main trail.