In the 1920s, the U.S. Post Office began experimenting with cross-country delivery of mail by air. Before the advent of radio guidance, mail pilots picked their way along from visible landmark to ...

WALNUT CREEK — It was 1944, and Carol Eisenman Clark clearly remembers the beam from the Acalanes Ridge beacon a mile or so away lighting up her bedroom below. It was a reassuring presence for a ...

They are the peculiar concrete markings that have been spotted all across America, prompting hikers and travellers to wonder what on Earth they could mean and where they are pointing to. But these ...

Picture the scene: you're driving through the arid American desert. There's been nothing around for miles. Suddenly, up ahead, you spot a gigantic concrete arrow. No, you're not hallucinating as you ...

This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated. Picture the scene: you’re driving through ...

There is no harbinger in America, a huge arrow lies on the ground, and there are things that are connected to the earth in some places rather than in one place. It is clearly hard to see as a traffic ...

WALNUT CREEK — It was 1944, and Carol Eisenman Clark clearly remembers the beam from the Acalanes Ridge beacon a mile or so away lighting up her bedroom below. It was a reassuring presence for a ...

Every so often, usually in the vast deserts of the American Southwest, a hiker or a backpacker will run across something puzzling: a ginormous concrete arrow, as much as seventy feet in length, just ...

WALNUT CREEK — It was 1944, and Carol Eisenman Clark clearly remembers the beam from the Acalanes Ridge beacon a mile or so away lighting up her bedroom below. It was a reassuring presence for a ...