To combat these challenges, postal officials arranged for acetylene gas beacons installed every three miles along airmail routes. These beacons could be seen for up to 10 miles, and were also used to ...

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 ...

GPS, satellites and radar are some technologies used today to get around. According to the Kansas Aviation Museum, in the late 20s and early 30s, the Department of Commerce placed large, 70-foot ...